Liked this so much that I got my own copy.

From the cover: Recovering from the recent death of his wife in a tragic accident, Tony Sheridan goes to stay with his sister-in-law, Lucy, and her husband, long-time friend Matt Prior, at their new home in the country - Otherways. It is a strange, circular, moated house, the only surviving creation of an eccentric and reclusive Edwardian architect.

Disturbed by memories of his wife, and a growing attraction to Lucy, Sheridan is also troubled by weird and vivid dreams. He learns that a murder committed at Otherways in 1939 still has a strange and malign power over those living in or near the house, as does a later scandal surrounding the murderer's brother, a nuclear scientist who defected to the Soviet Union.

These and other mysteries forewarn Sheridan of disaster as he and Lucy embark on a passionate affair. But disaster, when it strikes, is far worse than a wrecked marriage or a friendship betrayed. In uncovering the truth about Otherways, Sheridan realises too late that he is merely adding to the list of its victims - and that those closest to him may soon be among them.