Mira's looming threat forges some unlikely alliances.

Management makes a historic decision. Emily sends a warning. Quayle, Clare and Temple investigate the final Indigo cell. Howard Prime reaches out to an old contact.

Howard Prime and Emily work together to figure out Indigo's plans. Clare and Quayle consider their future. Howard must face the truth about his wife.

The fallout of the lockdown casts suspicions around the OI. Howard and Emily Prime find clues about the history of Management. Clare questions her allegiances.

The origins of the Crossing are revealed.

A new revelation puts Howard Prime and Quayle in jeopardy. Life at Echo is disrupted. Clare reconnects with her past.

Howard Prime, Quayle and Clare must unite against a common enemy. Emily Prime turns her investigation towards her other. Yanek probes Howard's past.

Howard is transferred to a mysterious prison called Echo. An unexpected visit gives Emily a connection to her old life. Emily Prime and Shaw's investigation is met with resistance.

Imprisoned on the Other Side, Howard's loyalties are tested. Emily Prime gets a promotion.

While hiding in Howard's life, Howard Prime must avoid detection at home and at the OI. Quayle and Clare struggle to adjust to their new arrangement.