When a rising young ballerina mysteriously falls to her death, Vincent senses that the understudy Victoria is hiding information about the dancer's murder. Cat and Tess discover that the victim tried to file a police report for an assault. Meanwhile, Cat seeks out Vincent's help to decipher a medical paper found in her mother's belongings, and J.T. worries that Cat's visits to the warehouse loft leave Vincent vulnerable to discovery by Muirfield's agents. Catherine encourages Vincent to help her investigate deeper into the Muirfield project, but when Vincent refuses, Cat investigates on her own, until her computer is wiped clean by a malicious virus. Tess tries her hand at dating again, but soon discovers that she's unknowingly involved with a married man. Heather moves out of Cat's apartment after growing uncomfortable with her sister's quest for more answers about their mother's death.