In 1910, Minnie Tipton finds herself beset by the onslaught of superstitions that envelope the Pennsylvania mansion her father bought. Convinced the house is haunted by the vengeful spirit of a Civil War captain, and worried by her father's rapidly worsening illness, Minnie delves into the home's dark past in an effort to help bring him peace. Yet the lingering impact of the war and the gruesome tale of murder she uncovers only foster more fear and threaten to unravel Minnie's own sanity. In the present day, Triss Bellamy eagerly steps into the role of bookshop manager in the mansion-turned-museum boasting ninety-nine doors. But Triss' dream job turns into a nightmare when havoc breaks loose with the arrival of her brother's team of self-proclaimed paranormal investigators. Their determination to find a rumored one-hundredth door—a dangerous portal to the madness long said to plague the mansion—results in calamity, leaving Triss no choice but to unravel the truth or watch her brother slip forever beyond her reach. A shadowy tale of historical hauntings and present-day mysteries masterfully penned by acclaimed thriller author Jaime Jo Wright, who is "in a class by herself" (Library Journal).