1 :01x01 - Once Upon a Time in the City of New York

Catherine Chandler is attacked in Central Park and left for dead with serious injuries. A mysterious figure, Vincent, rescues her and takes her to his underground Tunnel World beneath the streets of New York City to care for her. While together, Catherine and Vincent form a strong bond and Vincent is able to sense when she is in danger, even if she is not in the Tunnel World.

2 :01x02 - Terrible Savior

Catherine begins to wonder if Vincent is to blame when subway riders are attacked and suffer injuries that look like they were mauled by a bear. However, her lack of trust in Vincent places a large strain on their relationship.

3 :01x03 - Siege

At a party, a rich developer named Elliot Birch has his eye on Catherine and asks her out. Vincent soon learns that Catherine has met a man and must deal with the fact that she may be in love with someone else. Meanwhile, Vincent and Catherine investigate when elderly people are threatened.

4 :01x04 - No Way Down

Catherine and Vincent find themselves caught in the middle of a gang war. Vincent is temporarily blinded in an explosion and becomes separated from Catherine. When he wakes up, Vincent finds himself held hostage by the gang.

5 :01x05 - Masques

It's Halloween, the one night of the year that Vincent is safe above ground, and Vincent decides to attend a gala in honor of Brigit O'Donnell, a writer. Catherine is at the same party, but does not know that Brigit has become a target for a kidnapping plot.

6 :01x06 - The Beast Within

Mitch Denton, a childhood friend of Vincent's who grew up in the tunnels, arrives in New York and finds himself in the middle of one of Catherine's investigations.

7 :01x07 - Nor Iron Bars a Cage

Catherine gets a job offer from a Rhode Island company, but knows that leaving New York would mean leaving Vincent. Meanwhile, Vincent is held captive by scientists.

8 :01x08 - Song of Orpheus

Father's past is revealed as he goes above ground for the first time in nearly three decades in order to visit a friend. As he does so, he runs across the scene of a murder and is arrested for the crime. Vincent and Catherine partner up to help save Father.

9 :01x09 - Dark Spirit

Catherine investigates a mysterious death that sends her into the world of the occult and voodoo. As she investigates, Catherine's worst fears get the best of her.

10 :01x10 - A Children's Story

Kipper, a child that lives in the Tunnel World, sees a boy being kidnapped. After Kipper tells Vincent about the incident, Vincent has Catherine investigate a foster home who are selling children on the black market.

11 :01x11 - An Impossible Silence

Laura, a deaf tunnel dweller, sees a murder taking place and debates coming forward to help exonerate the man wrongly convicted for the murder.

12 :01x12 - Shades of Gray

Mouse, a tunnel dweller, is given the silent treatment after stealing from above. However, the others must turn for Mouse for help when Vincent and Father become trapped. Meanwhile, Catherine goes to Elliot Birch for help.

13 :01x13 - China Moon

A friend of Vincent is trapped in a "Romeo and Juliet" story when he falls in love with one woman but is forced to marry another through an arranged marriage.

14 :01x14 - The Alchemist

Paracelsus, a friend of Father's who was exiled, begins selling drugs to the world above. Meanwhile, Catherine goes undercover to investigate drug dealings and asks Vincent for help in the investigation.

15 :01x15 - Temptation

Joe becomes involved with a woman who works for a firm that is being investigated. Meanwhile, to commemorate their one-year anniversary since they met, Vincent heads to a lower cavern to find a gift for Catherine.

16 :01x16 - Promises of Someday

Catherine's new co-worker turns out to have a connection to the Tunnel World. Meanwhile, Father's long-lost son returns to New York after nearly 20 years away.

17 :01x17 - Down to a Sunless Sea

Steven Bass, Catherine's former finace, arrives in town and becomes friendly with Catherine again, but has hidden motives in doing so.

18 :01x18 - Fever

Mouse comes across a treasure ship that sunk hundreds of years ago. Meanwhile, a necklace that Mouse gives Catherine catches the eye of a shady antiques dealer.

19 :01x19 - Everything is Everything

Tony Ramos, a gypsy, tricks Catherine into giving him her purse. Catherine has a later encounter with Tony and he tells her his sob story.

20 :01x20 - To Reign in Hell

Catherine has a surprise visitor who has a hidden plan to lure Vincent into a lower section of the tunnels in order to kill him and take over the Tunnel World.

21 :01x21 - Ozymandias

Elliot Burch begins constructing Burch Tower, his lifelong dream. However, the construction poses serious problems for the Tunnel World. Meanwhile, Elliot proposes to Catherine.

22 :01x22 - A Happy Life

The anniversary of Catherine's mother's death sends Catherine into a deep depression, leading Vincent to make a tough decision and end his relationship with Catherine.

23 :02x01 - Chamber Music

While walking above one night, Vincent spots an ex-tunnel dweller named Rolley, who grew up in the tunnels and was known for being a piano prodigy but has since abandoned the tunnels and has become a drug addict. Vincent calls on Catherine to assist him in helping Rolley and tries to get him to come back to his friends down below but his guilt over the death of his piano teacher may not allow him to return.

24 :02x02 - Remember Love

Catherine longs for Vincent to escort her to a secret hidden place that she had as a child in Connecticut. Vincent soon realizes that there is too much danger if he were to venture above. Angry and distraught, he begins having visions of an angel who takes him on a journey of what life would have been like if he had never existed.

25 :02x03 - Ashes, Ashes

Vincent rescues a Russian sailor name Dimitri, from drowning and brings him to the tunnels below to recuperate. However, little does anyone know, Dimitri is carrying the pneumonic plague which soon becomes an epidemic amongst the residents of the tunnels and begins taking lives.

26 :02x04 - Dead of Winter

Vincent invites Catherine to Winterfest which is a grand celebration to those who live below and their helpers who live above. As everyone prepares for the celebration, Paracelsus prepares in seclusion to crash the event and hopes to get the ultimate revenge for being exiled so long ago.

27 :02x05 - God Bless the Child

While working at a help hot-line, Catherine encounters a prostitute who is pregnant and has no one to turn to for help. Catherine meets her and brings her to the tunnels where she gives birth to a baby girl. However, her stay in the tunnel world may become complicated when she falls in love with Vincent who does not know how to respond to her advances.

28 :02x06 - Sticks and Stones

Catherine has been working to put the leader of a deaf street gang behind bars. She is stunned to learn that Laura, an ex-tunnel dweller has fallen in with the gang and has fallen in love with a fellow gang member, who just happens to be an undercover cop working with Catherine.

29 :02x07 - A Fair and Perfect Knight

Father and Vincent are proud of Michael, a young man who grew up in the tunnel world who is leaving to attend college above. Michael moves in with Catherine temporarily until he gets settled in on campus and in the meantime he slowly begins to fall in love with her. Vincent soon must deal with jealousy issues of not only being able to go to college but of the blossoming love that Michael feels for Catherine.

30 :02x08 - Labyrinths

Brian is an unhappy young man whose parents are going through a divorce. He is also a avid player of Dungeons and Dragons and one evening spies upon Catherine and follows her to the basement and sees her enter into the tunnels and follows her down. Soon the Father, Vincent and the rest of the tunnel dwellers must decide just what to do with Brian.

31 :02x09 - Brothers

Devin, who had been working with a carnival, returns to the tunnels with a guest, a man named Charles, who suffers from elephant man's syndrome who had been imprisoned by his brother as part of the carnival sideshow. Devin brings him below where he knows that he will be safe and Charles soon befriends Vincent but must face the reality that the tunnels may not be where he belongs.

32 :02x10 - A Gentle Rain

Kanin has been living in the tunnels for the past 16 years and is now happily married to Olivia and they have a son together. However, Kanin's past slowly comes to the surface when a file crosses Catherine's desk and she must debate whether or not to turn him on DWI vehicular homicide charges.

33 :02x11 - The Outsiders

The tunnels becomes a place of danger when a murderous "family" appears and quickly makes a move to take over by beginning to murder other tunnel dwellers. This prompts Vincent to face his inner beast and he must come to terms with the fact that he will most likely have to kill some of the outsiders when worse comes to worse.

34 :02x12 - Orphans

Catherine gets bad news when she learns that her father has had a stroke. As he lingers near death she reveals to him her secret about Vincent. Later, after his death, Catherine falls into a deep depression and decides once and for all to leave her life above and move below to be with Vincent.

35 :02x13 - Arabesque

A world renowned ballerina and ex-tunnel dweller, named Lisa Campbell has come to New York for a series of performances. She quickly makes contact with Vincent which opens old wounds, as she was his first love and his insecurities about himself slowly come to the surface. Meanwhile, Catherine begins investigating Lisa's past which quickly puts her in great danger.

36 :02x14 - When the Bluebird Sings

While shopping in a bookstore, Catherine has a strange encounter with a man who begins following her around New York. When she confronts him, she learns he is an artist named Kristopher Gentian. However, when strange things begin to happen, both Vincent and Catherine begin to wonder if the man is really an artist or a ghost.

37 :02x15 - The Watcher

Catherine and Vincent's second anniversary celebration is interrupted by an anonymous caller who lets her know that he's watching her and whats more he has seen Vincent. Not wanting to get the police involved, Catherine soon finds herself at the mercy of her own fear when she realizes "The Watcher" has been in her apartment.

38 :02x16 - A Distant Shore

Catherine must travel to Los Angeles to gather information and interview a woman who may be involved in a murder case. Reluctant to leave Vincent, Catherine finally decides to go which puts their bond to the test. As Catherine becomes involved in the case in L.A. she soon runs into danger and Vincent is powerless to help her in New York.

39 :02x17 - Trial

Catherine and Joe have been working on a case involving a high power Wall Street celebrity whose child abuse turned deadly which resulted in the death of his son. Catherine is named the prosecutor in the case and she soon must deal with the challenge of trying to get the child's mother to testify against her husband.

40 :02x18 - A Kingdom by the Sea

Elliot Burch has returned to New York and finds that his life his in danger. It seems a death squad has followed him to New York due to dirty dealings that he was involved in Central America. He soon gets Catherine involved who puts her own life on the line to help him.

41 :02x19 - The Hollow Men

Two rich kids have been targeting and murdering prostitutes for fun. Late one night, Vincent witnesses their latest murder and is unable to stop them. Catherine soon puts together a case against them but has a hard time putting them away. Meanwhile, Vincent has set on his own to put an end to their madness.

42 :02x20 - What Rough Beast

Catherine is attacked in the park by two men disguised as policemen. Naturally, Vincent comes to her rescue but it soon becomes apparent that this event was a setup to get Vincent out in the open and has all been orchestrated by a shadowy figure who has hired an investigative reporter to uncover the existence of Vincent.

43 :02x21 - Ceremony of Innocence

Following the death of investigative reporter, Bernie Spirko, Elliot Burch and Catherine set out to find the man who hired and killed Spirko. Little do either of them know that the man they are seeking is Paracelsus and he has set into motion the next stage of his diabolical plan. He lies to Vincent about his birth which brings Vincent to the verge of madness.

44 :02x22 - The Rest is Silence

Following the ordeal with Paracelcus, Vincent moves forward toward a stress-aggravated mental collapse. Vincent continues to come to terms with the beast in himself and finds himself losing control of his thoughts. He finally decides to go into seclusion into a deep chamber far back through the catacombs where madness takes over his mind. Meanwhile, Catherine, Father and the rest of tunnel dwellers try to find some way to help Vincent.

45 :03x01 - Though Lovers Be Lost (1)

Catherine reaches Vincent in the catacomb and rescues Vincent from his madness. However, as Vincent begins to recover, he realizes he has lost his bond with Catherine and is unable to sense when she is in danger. Meanwhile, a deadly explosion lands Joe in the hospital where Catherine discovers that she is pregnant and debates how to tell Vincent, but as Catherine begins investigating the explosion it leads to her being kidnapped by a powerful crime syndicate led by a shadowy figure

46 :03x02 - Though Lovers Be Lost (2)

Vincent, Joe and Elliot Burch all continue to search for Catherine who is still being held captive as her baby grows inside her. As the delivery comes closer, Vincent begins sensing the child's existence which lures him to the skyscraper where Catherine is being held. However, Vincent may just be too late as the evil Gabriel has plans for Catherine's child.

47 :03x03 - Walk Slowly

Following Catherine's death on the rooftop, Vincent takes her back to her apartment and leaves her on her bed. Later, as Vincent is grieving, Joe begins an investigation into Catherine's murder, hiring a private detective Diana Bennett, who encounters Elliot Burch and also members of the Tunnel World at Catherine's funeral. Meanwhile, Vincent's past demons re-surface as well as memories of Catherine who soon begins to search for his son.

48 :03x04 - Nevermore

Vincent has begun his quest to find his son and makes his first move by revealing himself to Elliot. Meanwhile, Diana has become immersed into Catherine's life and soon discovers the entrance into the Tunnel World in the basement of Catherine's apartment building and Elliot discovers the role Moreno played in Catherine's death which leads to a confrontation resulting in Vincent being shot.

49 :03x05 - Snow

Recovering from gunshot wounds, Vincent begins to have nightmares about a bad snowstorm reaching the tunnels. Meanwhile, Gabriel hires an assassin named Snow to find and kill Vincent. With Moreno dead, Joe has taken over as district attorney and asks Diana to continue her investigation into Catherine's death. Unknown to anyone, Snow enters the tunnels and Diana also gains entry and begins her search for some answers.

50 :03x06 - Beggar's Comet

Not wanting to put the Tunnel World in further danger, Vincent decides to leave the tunnels and with the death of Snow, Gabriel plots for Vincent's demise. Meanwhile, Elliot is on the verge of financial ruin and Gabriel promises him he will restore his empire if Elliot were to betray Vincent. Diana reveals what she has found to Joe and later she stakes out Catherine's grave where she encounters Vincent who is in critical condition following an explosion on the docks that may have cost Elliot his life.

51 :03x07 - A Time to Heal

52 :03x08 - Chimes at Midnight

53 :03x09 - Invictus

54 :03x10 - In the Forests of the Night

55 :03x11 - The Reckoning

56 :03x12 - Legacies