At St. Anne’s Cathedral, Roy comes in to confess and asks the priest if he believes in God and the Devil talking to people. Ray talks about seeing things: a man getting on a public bus. The man observes a woman sitting nearby holding a blue back pack. He opens a case and takes out a gas mask and a gas cylinder. He puts on the mask and unleashes the gas on the other passengers, then takes the back pack and exits. Roy begs for it to stop and runs out. he drops a piece of paper with screaming faces on it.
Elsewhere in town, the gas mask-wearing man gets into a car and his partner drives away. The police arrive a few minutes later in response to the blocked traffic and finds the passengers dead, trapped in an amber-like substance filling the entire bus.
FBI agents, including Charlie and Olivia, are attending John Scott’s funeral along with his family. John’s mother looks contemptuously at Olivia as the funeral comes to a close. Afterward, Olivia wonders to Charlie if John’s mother blames her, and Charlie tries to reassure her. Broyles arrives to call her to the bus. At a diner, Walter and Peter are sharing breakfast when Peter spots a man following him and confront him. The man says Peter was supposed to check in and Peter warns that if anyone else knows he’s back, he’ll go after his follower first. Peter takes the man’s camera memory chip and returns to the table where Walter (eventually) tells him that Olivia called.
They meet at the bus and conclude that someone released the gas as a means of getting attention. Elsewhere, the man who released the gas and his partner are looking through a blue backpack for something but don’t find it.
Roy is working in his office and starts sketching a figure with bleeding hands.
At his lab, Walter examines the amber-like substance and asks Peter about the man in the restaurant. Peter makes an excuse and denies knowing the man. At a warehouse, Olivia goes over the bodies and sees a man holding a video camera when he died. They replay the camera and Olivia sees a woman with a blue back pack that she wasn’t holding after she died. They identify the woman as Evelina Mendoza, an undercover DEA agent. They bring in her handler, Grant Davidson, for questioning. The handler reveals the agent was infiltrating a major drug cartel and put in a request to be removed after she heard them talking about The Pattern. He asks to ID her body and he and Olivia talk briefly about their shared experiences in losing someone close. He goes in to say goodbye to Evelina while Olivia remains outside and watches as he takes Evelina’s hand.
Olivia returns to the lab where Peter has obtained a piano to play for his father and Walter reveals they’ve identified the gas. Only Massive Dynamic and its subsidiaries could have manufactured it. Charlie calls: the priest who Roy talked to earlier has called in about the fact Roy knew about the bus. They go to his apartment and find it covered with pictures and models of dozens of disasters, including Flight 627. All of them are dated before they took place. They bring in Roy for questioning while Olivia talks to Nina Sharp. She admits that the chemicals could have been stolen from any lab and offers her complete cooperation. Olivia then asks about Nina’s earlier statement that technology is running out of control, but that everything she investigates is tied back to Massive Dynamic. Nina suggests in return that it’s odd that Olivia is somehow responsible given her recent involvement. Nina mentions “attacks” and admits that there was another similar incident in Prague… that Broyles doesn’t tell Olivia about.
Charlie talks to Roy who denies any involvement but claims he gets the visions and can only get rid of them by drawing or building what he sees. Peter and Broyles believe him. Walter suggests that Roy is psychically linked with someone involved in the events. Broyles is skeptical and Walter offers to prove it. Afterward, Olivia talks to Broyles who admits he isn’t telling her everything but he has good reason not to. She demands to know what she’s dealing with, and he says she will… when she’s ready. Until then, he’ll have to trust her.
Walter and Peter take Roy to a hospital and run him through a MRI scanner in the hopes they can intercept the telepathic messages. Roy’s vitals spike and his blood vessels start swelling. They shut it down and they realize there’s some magnetic compound in Roy’s blood that reacted to the magnetic scanner in the MRI.
Back at the lab, they go through Walter’s files and find information about how William and Bell worked on telepathy. The government wanted to use the telepathic “Ghost Network” to send clandestine information, and asked Walter to come up with a way to make someone a receptor by inserting iridium into their brain. Peter finds a file identifying Roy as one of Walter’s experiments. Walter insists that he didn’t give Roy enough metal to react, and it must have multipled in his bloodstream. Peter is furious at his father’s using Roy as an unwilling subject. Walter explains that someone else has perfected the Ghost Network and Roy is overhearing what they’re “communicating.” He concludes that Roy’s brain is interpreting the sensory input but it will take months to build a receptor. However, Walter can rewire Roy’s brain to redirect the images to Roy’s auditory sensors. He needs one specialized piece of equipment, hidden in their old home in Cambridge.
Olivia and Peter go to the house and the current residents don’t answer the door. Peter breaks in and they go in to get the device, while talking about Peter’s childhood. Peter in turn wonders how Olivia ended up in law enforcement. The device is missing but Peter remembers a dumbwaiter that’s covered over and finds the device inside.
As Walter prepares Roy for surgery, Roy wonders why he looks familiar. Walter starts drilling into Roy’s skull then hooks up his brain for electricity and start showing him images to stimulate his visual cortex. Roy starts suffering sensory crossover then starts reciting Latin. Astrid translates it as something happening in an hour. Roy keeps saying words he doesn’t understand, that say an exchange is being made at South Station. Olivia realizes that the undercover agent had it on her the entire time and goes to the morgue and discovers that her right hand was cut open. Grant cut open her hand and removed the data.
Olivia heads for the station and notifies Broyles to send a plainclothes team. Meanwhile, Roy picks up Grant’s conversation with his contact at the station. Olivia arrives and Peter calls to relay what Roy’s “hearing.” Olivia goes into the station and catches up to Davidson just as someone shoots him. Olivia figures they’ve already made the exchange and goes after the man from the bus. He shoves his way out past the pedestrians and through the streets but Charlie corners him the other way. They order the man to put down the case and the gun, and then he steps back and is run over by a bus.
At FBI Headquarters, a team goes over the contents of the briefcase and finds a single glass disk. Olivia and Broyles examine it but have no idea what it is. Broyles identifies the man as Matthew Ziegler and says they now have a face and a means to tap their communications. Further, three of Roy’s models deal with incidents they’re not aware of. He turns the files over to Olivia and asks for her thoughts.
Back at the laboratory, Olivia meets with Roy who says he’s not receiving any more transmissions. They figure that once the enemy saw Olivia at the station, they figured their communication system was compromised. They ask Roy to let them know if he picks up any other communications and send him on his way.
Broyles meets secretly with Nina and gives her the disc, and Nina admits she’s still interested in “hiring” Olivia away from Broyles. The two verbally spar for a bit and then depart. Nina takes the disc to a secret laboratory and the head scientists says it’s what they need to break the encryption. He also shows Nina their most recent progress: a linkage to John Scott’s brain: his body inside of a stasis chamber.
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