A young woman at an intensive wellness retreat and a struggling musician vow to turn their lives aroundor die tryingin this provocative, “unputdownable” horror story. (Josh Malerman)

Madison has seen better days. Reeling from a bad breakup, self-soothing with junk food, and totally consumed by her lack of direction, shes in need of a big reset. When she runs into an old acquaintance at the gym, Madison is shocked by how fit theyve suddenly become. The cause? An all-female fitness boot camp led by ex-military guru Ellie Fellowes. The course is characterized by grueling reps and minimal contact with the outside world, and when Madison signs up to experience it herself, something doesnt feel right. The other students keep acting strangely; Ellie seems almost superhuman, and her intense motivational methods are becoming bizarre, even dangerous. But Madison is gettingresults.How can she stop now?

Musician Johnny Blake has been struggling with a pain pill addiction after a very public, very bad fall. At the encouragement of loved ones, he retreats to a secluded cottage to detox. But Johnny isnt alone. Something is lurking in the shadows of his new homea creature unnatural and hungry, one that traps Johnny in a frightening bargain. If Johnny doesnt stay off his pills and keep his end of the deal, he will be eaten alive.

As Madison and Johnnys predicaments spiral into the unthinkable, they will have to look within to find the true and terrifying answer to the age-old question:How badly do you want it?

Nerve-shredding and compulsively readable,Ill Quit When Im Deadmarks Luke Smitherd as a major voice in horror to watch.