Kiera investigates the mysterious disappearance of several deceased time travellers’ bodies. Alec is taken hostage by Garza on orders from his future self.

The two-year anniversary of the alien invasion is fast approaching as the people of Charleston prepare for another potentially devastating offensive. A sniper attack by an unlikely gunman creates questions and doubts within the new government. Hal believes he knows the identity of the mole. And Anne’s concern for her baby continues to grow.

A cattle heist sends the team on an urgent search for the missing livestock and driver as well as the thieves. Walt is concerned by Vic's fearful behavior when she receives a mysterious bouquet of flowers.

Don renews his battle with Ted after seeing his relationship with Peggy, Sally interviews at a boarding school, and Pete discovers Bob Benson's background.