Plot summary
Alison tells Sarah that they are clones. In the briefcase, Sarah and Felix find that three of the clones Katja had found were already dead. Sarah goes to the police station to ask Art for the money back, only to be reinstated as a police detective and drafted to cover Katja's murder. Worried that her own fingerprints might be identical to Katja's, she deletes them from the record. Art and Sarah track down the killer, who shoots at them. Sarah saves Art's life, and then gives chase, only to find that the killer is another clone, a Ukrainian named Helena. Sarah stabs Helena, but Helena escapes. Art returns the money to Sarah, who learns that Beth had received it from Alison to help with her investigation into their situation. Sarah thus returns the money to Alison.
Credits
Adapted from Wikipedia contributors, List of Orphan Black episodes. HTML formatting and reference markers removed.