A woman working in the house of a reclusive horror director stumbles upon terrifying secrets, from the author of Good Girls Don't Die and Horseman. Single mom Harry Adams has always loved horror movies, so when she's offered a job cleaning for revered horror director Javier Castillo, she leaps at the chance. His forbidding Chicago mansion, Bright Horses, is filled from top to bottom with terrifying props and costumes, as well as glittering awards from his decades-long career making films that thrilled audiences and dominated the box office-until family tragedy and scandal forced him to vanish from the industry.

Javier values discretion, so Harry tries to clean the house immaculately and keep her head down-she needs the money from this job to support her son. But then she starts hearing noises from behind a locked door. Noises that sound remarkably like a human voice calling for help, though Javier lives alone and never has visitors.

Harry knows that not asking questions is a vital part of keeping her job, but she soon finds that the house-and her enigmatic boss-have secrets she can't ignore...