The Laundry is the world’s only ISO9001-approved occult intelligence agency. As a Laundry officer, you're empowered and bound to investigate bizarre cults, thwart misguided experiments, exorcise demons from computer networks or the brains of voters, and ensure that the world doesn't get destroyed ahead of schedule... and come in under budget, or the Auditors will eat your soul.
You can't efficiently protect the United Kingdom from the scum of the multiverse (in an efficient, enterprise-focussed sustainable customer-facing manner) without this employee's handbook.
The Agent's Handbook includes rules for creating veteran Laundry operatives - or agents who might not be entirely human - as well as new gear, special training, expanded rules and notes on occult espionage. The Laundry Files: Agent's Handbook – for those employees who, on the whole, would prefer not to be devoured by alien space gods. Everyone else, form an orderly queue for Cthulhu.