After discovering that the spy agency he works for is hiding a gateway to a parallel dimension, a low-level UN bureaucrat in Berlin is thrust into a shadow world of intrigue and danger and must determine if he can trust his near-identical counterpart in the other world.
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.
Imprisoned on the Other Side, Howard's loyalties are tested. Emily Prime gets a promotion.
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.
Howard Prime, Quayle and Clare must unite against a common enemy. Emily Prime turns her investigation towards her other. Yanek probes Howard's past.
A new revelation puts Howard Prime and Quayle in jeopardy. Life at Echo is disrupted. Clare reconnects with her past.
Howard Silk, a lowly cog in the bureaucratic machinery of a Berlin-based UN spy agency. When Howard discovers that his organization safeguards the secret of a crossing into a parallel dimension, he is thrust into a shadow world of intrigue, danger, and double cross. The only man he can trust is "Prime," Howard's near-identical counterpart from this parallel world.
Howard and his counterpart must work together. Baldwin comes face to face with her past. Emily, from the other side, attempts to make sense of her orders.
Both sides turn to diplomacy to resolve a conflict. Emily obtains a special visa. Howard interrogates a suspect.
Both Howards deepen their investigation of the conspiracy. Quayle meets one of Howard's sources; Clare must decide what to do about Baldwin.
Howard discovers another side of Emily; Howard and Emily search for answers about a mysterious drop site. Aldrich and Quayle seek intel from an old friend.
Aldrich questions a not-too recent death in the office. Emily, Howard and Shaw follow a lead.
Clare's past is revealed. Quayle suffers through his own birthday party.
The aftermath of the Indigo school discovery takes an emotional toll. Quayle grapples with his wife's new identity.
Howard attempts to thwart the Guest's plans. Howard and Emily chase Kaspar.