Sam's Birthday puts Kiera on the path to an emotional meltdown which triggers an internal diagnostic within Kiera's CMR that forces her to deal with her loss or lose her tech abilities. Meanwhile, Kiera becomes the target of a department mole hunt, when Dillon is ousted and Escher installs Nora Masters as his puppet.

Kiera, injured during her and Brad's escape from the future soldiers, has a renewed desire to return to her son in the future. Brad reunites with the future soldiers in a bid to gain their trust and work from the inside. Alec gets revenge on Kellog by hacking into Piron which causes unexpected consequences and revelations.