When a ride breaks down before closing, friends Mateo, Taylor, and Zari find themselves stuck inside the haunted house for the night and discover a hidden staircase leading to a dark crypt.

"Everyone has heard the story of the Narrow. The river that runs behind the Atwood School is only a few feet across and seemingly placid, but beneath the surface, the waters are deep and vicious. It's said that no one who has fallen in has ever survived. Eden White knows that isn't true. Six years ago, she saw Delphine Fournier fall into the Narrow--and live. Delphine now lives in careful isolation, sealed off from the world. Even a single drop of...