Still grieving his toddler's death, Detective Dan Brennan of the Philadelphia P.D. returns to the force and is assigned to investigate a socialite's fatal fall down her mansion's staircase. But the open-and-shut case is turned on its head when the victim's epileptic daughter alleges her mother was murdered. Her evidence? The dead. Vintage crime-scene photographs displayed on the mansion's walls have told her so.
Compelled by the reclusive teen's pleas, Brennan investigates her mother's death and the disturbing secrets hidden in plain sight on the mansion's walls. He soon discovers the vintage photographs are tied to a quartet of cold cases with a disturbing commonality. As the wealthy family's long, sordid history threatens to bury him, Brennan's forced to make a choice: save his career, or risk it all for the chance to hear his daughter's voice again.