Bob Howard is taking a much needed break from the field to catch up on his filing in The Laundry's archives when a top secret dossier known as The Fuller Memorandum vanishes-along with his boss, who the agency's executives believe stole the file.

Determined to discover exactly what the memorandum contained, Bob runs afoul of Russian agents, ancient demons, and the apostles of a hideous faith, who have plans to raise a very unpleasant undead entity known as the Eater of Souls...