Plot summary
As Amelia meets Helena, police arrive to arrest Sarah, while Helena escapes. Sarah is about to tell Art the whole story, but gets spirited away by Daniel Rosen, a Dyad operative. Sarah is brought to Rachel Duncan, a clone high in the Dyad organization, who offers Sarah and Kira protection. Leekie also offers the same to Alison and Cosima, as Cosima begins to display symptoms of a respiratory illness that Katja had. Alison confronts Aynsley a final time, ending with Alison watching Aynsley accidentally choke to death on her own scarf.
Amelia tells a woman pretending to be Sarah that Mrs. S is not who she says she is, but this "Sarah" is actually Helena, who stabs Amelia, blaming her for turning her over to the Proletheans. When Sarah finds her body, she shoots Helena. Alison signs Leekie's document, while Sarah goes to meet Rachel, planning to sign as well. However on the way, Cosima and Delphine decipher a code inside the clone genome: "this organism and derivative genetic material is restricted intellectual property." By phone, Cosima warns Sarah, who leaves Dyad without signing the contract. Donnie meets with Leekie, thus revealing he is Alison's monitor. Sarah returns to discover Mrs. S's home ransacked and Kira and Mrs. S gone.
Credits
Adapted from Wikipedia contributors, List of Orphan Black episodes. HTML formatting and reference markers removed.