Darkness Falls - Jigsaw of Souls Series, #6

A dark reflection stalks the night.Vincent Donnelly has faced pain, death, and madness. His past is a haze of fractured memories. A host of restless spirits inhabited his tortured psyche once. He has inherited their powers, their magic. But all he wants is to be free of the nightmares that plague him. Fleeing from the confines of a demonic asylum, Vincent and his allies take refuge in a remote mountain cabin.
Lost, wounded, unable to access his supernatural abilities, Vincent struggles to sever the link between himself and the personification of Chaos itself. But it is not so easy to destroy. This sinister entity has created a host body of its own. A body that looks exactly like Vincent. Hunted by this dark replica and its monstrous creations, Vincent and his friends are forced into a bloody struggle for survival.
But a powerful ally awaits-a being that could end the double's chaotic reign once and for all. Assuming Vincent can survive long enough to find it.