On a picture-perfect morning in Bath, England, a teenage girl's body is found on the towpath of a canal. Police detective Zoe Benedict is convinced the department head should look beyond the usual domestic motives to solve the brutal murder case. But no one wants to hear any far-fetched ideas from the department's black sheep. Meanwhile, Zoe's sister, Sally, has started working as a housekeeper for a wealthy entrepreneur whose eccentricities are beginning to seem increasingly repugnant, and possibly dangerous. As Zoe digs into the case and Sally's suspicions grow, all signs point to one conclusion: There's something very wrong at the house on Hanging Hill.