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Faced with a frightening threat from the Realm, Holden attempts to fix what is broken – getting assistance from an unexpected source. Luke and Willa make a horrifying discovery that has further ramifications than even they understand. Tom and Diane are stunned to realize the depth of what is going on with Holden. And Willa and Luke come face to face with Yellow Jacket.

Holden and Jeff step up their efforts to learn about Edgar Abbott, and uncover more than they bargained for. Willa turns to Luke for help in understanding what's going on with Holden – leaving Luke conflicted. Charlie begins to comprehend the danger Diego presents, and has a tense confrontation with a surprising foe. Meanwhile, Diane and Tom struggle with how to continue their work for Agent Borden. And as part of his new role at Hollow Sky, Yellow Jacket pays a visit to Pastor Ian.

Luke discovers Holden sleepwalking, and helps him unearth a new clue into what is happening with the Realm. Willa steps in to help Luke with a difficult situation. Charlie is given the opportunity to get what she's been seeking, while Shoemacher continues to recruit followers into Hollow Sky. Meanwhile, Charlie and Holden have a strange reunion, and Diego makes his way towards Ft. Reed – and Holden.

Holden continues to be plagued by disturbing nightmares and finds it harder to control his powers at work. Luke finds himself in danger of falling back into a bad habit, while Jeff is furious when he learns Pastor Ian and Helping Hands are trying to get close to Christine. A mysterious coma patient in Argentina named Diego awakens a changed man.

With his mission in the Realm seemingly behind him, Holden throws himself into his new 'normal' life, working a regular job and furthering his relationship with Willa, but he can't shake the feeling that something is coming. Meanwhile, Diane is asked to make a huge sacrifice to further the investigation into Hollow Sky, one that doesn't sit well with Tom, and Charlie reappears hiding a secret, and acting on orders from Yellow Jacket.