Plot summary
Sarah, Felix, and Kira arrive at a house belonging to Cal Morrison, who is revealed to be one of Sarah's marks and Kira's father. He allows the three to stay for a little while. Felix returns to the city to support Alison in her play. Angela tries, and fails, to befriend Alison to learn more about the lookalikes. Before the play's debut, Alison drinks too much, then falls off the stage during her performance. Cosima and Delphine investigate the death of Jennifer Fitzsimmons, a clone who died from the same respiratory illness as Katja and Cosima.
They autopsy the body and believe that the illness is possibly linked to the clones' infertility. Art begins to surveil Henrik's ranch, as Henrik marries Helena, then takes her away to a room. Daniel, who spent the episode looking for Sarah, tracks her down and kidnaps her, while also murdering a local police officer. Cal finds them, and he crashes his truck into their car.
Credits
Adapted from Wikipedia contributors, List of Orphan Black episodes. HTML formatting and reference markers removed.