The License to Summon (1e)
Wisely did Ibn Schacabao say¸ that happy is the tomb where no wizard hath lain¸ happy the town at night whose wizards are all ashes¸ and happy the line manager whose wizards hath filled in their timesheets for this Sabbat-night.
"The Laundry - that top-secret¸ bottom-drawer branch of British espionage - was founded to ensure that magic is kept under control¸ and that no-one summons the Great Old Ones ahead of schedule. The best way to fight magic is with more magic¸ which is exactly like fighting fire by hitting it with a molotov cocktail. Health and Safety can't help you now...
"License to Summon explores the dark side of Computational Demonology and arcane science within the Laundry¸ as well as the magic of other agencies... and other entities. New spells¸ new gadgets¸ new ways to end the world!