Six months ago, Jim Hoke’s daughter Wendy disappeared from her room. All Jim caught was a glimpse of a hulking figure at the window—the kind of late night vision that’s easily written off as a hallucination. No one believes Jim’s story—and six months later, the retired pathologist is just looking for anyone who’ll still listen. And even if he finds someone, should they believe him? Jim already retired early for planting evidence against an alleged killer. His word doesn’t mean much—and it means even less with him as a suspect in Wendy’s disappearance. He can’t leave town, he can’t forget what he saw, and he get any sleep thanks to the nightmares.

With Wendy’s disappearance declared the coldest of cases, Jim believes he’s the only one who cares about finding his daughter. And he’s got a withered Father’s Day card in his pocket to remind him—all he can do is his best. So he better step it up. Jim goes into business for himself, tracking leads and harassing anyone who’s polite enough to listen to his story. He dives into rabbit hole after rabbit hole, until he meets someone else like him. Then another, then another, a whole community of people who’ve lost someone to a cryptid they call the Floating Man—just like the huge creature Jim saw take Wendy. Suddenly, Wendy’s abductor has a name—the Floating Man. And Jim’s obsession has direction—he’s got to track down the Floating Man, uncover his crimes and free not just his daughter Wendy, but everyone who's been lost.