The Door of the Unreal - Gerald BISS

An early werewolf novel, praised by H.P Lovecraft. The only weird fiction from an author of mainly crime fiction. Two strange disappearances occur on a road in Sussex. The second involved a member of the aristocracy and a famous actress, so a large, but fruitless investigation is held by Scotland Yard. An American, visiting an old friend, who is of the local gentry, suspects something horrible and begins to investigate to verify his fears.. - Summary by Alan Winterrowd