Simon Clark is one of my favorite authors in the horror genre. Blood Crazy, King Blood, and Vamphyrric are all superb, unique, and amazing works. Darker, like his first novel Nailed by the Heart, suffers from a certain vagueness that occasionally crops up in Clark's work.
The characters here must face an overwhelming evil force and though we grow to like our protagonists, I found it difficult to truly understand them. Every so often someone would do something I found completely out of character, merely in an effort to serve the story line. Clark shows his hand a bit too much in this one, though the novel remains a gripping read. You simply might be left with too many questions at the end of it.