When Rose Colter's car breaks down in the Nevada desert, the silence of the night is broken by a radio broadcast of a voicemail message from her best friend, Gaby. A message Rose has listened to countless times over the past year. The last one Gaby left before she died. So Rose follows the lights from the closest radio tower to Lotus Valley, a small town where prophets are a dime a dozen and secrets lurk in every shadow. And according to Cassie Cyrene, the town's third most accurate prophet, they've been waiting for her. Because Rose's arrival is part of a looming prophecy, one that says a flood will destroy Lotus Valley in just three days' time. Rose believes if the prophecy comes true then it will confirm her worst fear—the PTSD she was diagnosed with after Gaby's death has changed her in ways she can't face. So with help from new friends, Rose sets out to stop the flood, but her connection to it, and to this strange little town, runs deeper than she could've imagined.