The Seven Days of Cain is a novel written by Ramsey Campbell. It was first published in 2010.
Is anyone really innocent?
On two continents, weeks apart, two people are brutally murdered: a Barcelona street performer and a New York playwright are each gruesomely tortured to death. In Britain, photographer Andy Bentley begins receiving mysterious emails. The messages refer to the killings and contain hints that the murderer has a personal connection to Andy. But what is it? Are the emails coming from the killer himself? And what, if anything, does Andy’s past have to do with the deaths? As the answers begin to take shape Andy will be forced to confront not only the consequences of his actions, but also the uncertainly of reality itself. Before that happens, how much that he loves will be destroyed?