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.
Willa shows up unexpectedly at the Matthews house for an uncomfortable "meet the family" dinner. Willa struggles with trying to convince Arthur to let go of the Realm, while she and Holden try to navigate their relationship. Meanwhile, Charlie learns some surprising secrets during an unauthorized house call at Yellow Jacket's request.
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.
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.
Holden turns to Charlie for help in understanding what is happening with him and the Realm - but she is reluctant to share why she's back in Ft. Reed. Jeff digs up info on the mysterious Edgar and what his connection to Holden might be. Diane and Tom feel pressured to learn more about Pastor Ian. Meanwhile, Willa and Holden realize they need to work on their communication.
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.
Diego's latest attack hits close to the Matthews home, leaving Holden and Charlie to try and explain what is happening to a frantic Tom and Diane. Agent Borden furthers her plan to take down Hollow Sky, while Luke and Willa take drastic steps.