S1, E6: Undercover as Lexie, Cassie performs all the tasks of the investigation into Lexie's murder. But she surprises herself when she is utterly emotionally seduced by the house along with Daniel, Rafe, Abby and Justin—Lexie's devoted friends. Just as she starts to question if Lexie's murderer is actually in the house, an attack on the housemates comes from outside. Meanwhile, Rob reaches out to Sandra, Jonathon's ex-girlfriend, the rape victim from his recovered memory. Sandra denies it was rape, and Rob is powerless to use his unique knowledge to pursue Jonathon as the prime suspect in both cases. When the suspect he arrested is cleared, Sam is upset that Cassie chooses to remain undercover, but Cassie is relieved. Right now, it is easier to be Lexie than it is to be Cassie.