The Apocalypse Codex (2012) is the fourth novel by Charles Stross in his "Laundry" series of Lovecraftian spy thrillers. The previous novels in the series were The Atrocity Archives (2004), The Jennifer Morgue (2006), and The Fuller Memorandum (2010). The novels follow the protagonist Bob Howard, an agent for the intelligence agency known as the Laundry.