The New York Times bestselling author of Dark & Shallow Lies delivers another chilling supernatural thriller filled with murder, romance, and a decades-long mystery that haunts a small Florida town.

The perfect blend of Natasha Preston, Krystal Sutherland, and Delia Owens, with a paranormal twist.

Mount Orange, Florida, is famous for two things: cerulean freshwater springs, ideal for free divers who aren't afraid of lurking gators. And the gruesome cold case murder of best friends, Bailey and Celeste, twenty years ago.

Bailey and Celeste's murders cast a permanent darkness over sunny Mount Orange. Tru has always lived in that shadow. Now she's supposed to head to FSU in the fall with her boyfriend, but those unsolved murders-and the death of her own sister-invade her every thought. It's only in the shadowy deep of Hidden Glen Springs that she can breathe.

When a strange girl named Rio rolls into town, hell-bent on figuring out who killed Bailey and Celeste, Tru can't resist entangling herself in the thrill of solving the decades old mystery any more than she can resist her familiar, aching attraction to Rio.

As the summer heat ignites, so does the spark between Tru and Rio…along with their otherworldy connection to Bailey and Celeste. But when someone begins stalking them, the girls become convinced the killer is back in town. And if they keep digging into the past, Tru and Rio know this time, it could be their blood that makes the springs run red.