Plot summary
With Sarah and her family taken captive by Neolution, Rachel offers to let them live in peace as long as Kira submits to occasional testing. Refusing to allow this, Sarah, Felix and Siobhan conspire with M.K. to retrieve Kira from school before Rachel and Ferdinand can. Their plan is successful, but M.K. stays behind at Felix's loft to distract Ferdinand, who brutally kills her, for which Rachel ends their relationship and fires him. Sensing M.K.'s death, Kira forces Sarah to take her back to Rachel for testing so she can understand herself. Meanwhile Donnie takes Helena to the hospital, where her unborn babies heal rapidly. Suspicious that the doctor treating her may be a Neolutionist, Helena attacks her and flees. On the island, Cosima meets P.T. Westmorland. Delphine meets with Siobhan in secret.
Credits
Adapted from Wikipedia contributors, List of Orphan Black episodes. HTML formatting and reference markers removed.