The group faces a threat when they discover a new refugee is a spy working for Sentinel Services; Reed visits his estranged father and learns secrets that could prove useful.

Caleb gets an insight on the true nature of his past; Dolores seeks out Rehoboam’s predecessor, while Maeve tracks her down; Bernard, Stubbs, and William escape from all the chaos.

Serac’s past is revealed; Dolores pressures Liam for access to Rehoboam; Caleb is dosed with an unusual party drug.