When you're at your wit's end...When nothing seems to work... 

When you're losing sleep...When your neighbour is giving you hell...Would you call upon the devil?

Cat Thomas has just moved from Florida to an idyllic flat in historic Edinburgh. Everything seems perfect. Everything seems serene. Except for the noisy, obnoxious, uncooperative musician upstairs.

When all else fails, Cat is talked into attending a seance at a creepy Scottish castle. She makes an appeal directly to Satan. And finds that the nightmare has just begun...

The Devil Upstairs is the astonishing new novel from the internationally acclaimed author of The Lamplighter and The Dark Side.