The Exorcism of Winchester House — Douglas Wynne

The Winchester House: a rambling Victorian mansion shrouded in secrecy and speculation. Built by the reclusive heiress of a rifle fortune with endless, labyrinthine additions, rumors swirl of vengeful spirits, occult mysteries, and a temple of resurrection. But when Father Diego Montero hears the dying confession of a carpenter who worked there, he discovers an even darker tale. It is the story of a mother who raised a ghost, of a sorceress who built a castle to house her dead daughter's spirit, and of a blood pact forged with a dark power. Drawn into the mystery at the heart of the notorious house, Father Diego is wholly unprepared for what he discovers. To defend against a force that threatens to wreak havoc on the world at large, he must rely on his own secret occult knowledge and risk expulsion from the Church. But with his personal demons lurking in the shadows, can he save Winchester House and its occupants from the evil that infuses it, or will it crumble under the weight of its dark history?