Vengeance is Mine — Ian Johnstone

In the back of Nathan's mind was a secret, vaguely remembered from his childhood. It was a secret that would change not only his life but also the lives of all around him. There was a house, a very special house where the Mistress battled to drive out demons from those they possessed, and it was inevitable that when Nathan was wrongly accused of infidelity by his wife he would be drawn back towards the house. Only slowly would the secrets of the past be revealed for Nathan and, too, for the Mistress of the House. The battle with evil had only just started…