The Esoterrorists (2006)

Publisher blurb:

A complete new roleplaying game by Robin D Laws

You are elite investigators combating the plots of the Esoterrorists, a loose affiliation of occult terrorists intent on tearing the fabric of the world. The Esoterrorists introduces the GUMSHOE rules system, which revolutionizes investigative scenarios by ensuring that players are never deprived of the crucial clues they need to move the story forward.

With The Esoterrorists you can

• Equip your characters with up to 39 fine-grained investigative abilities, ranging from Interrogation and Data Retrieval to the ever-popular Forensic Entomology and always useful Bullshit Detector.
• Round them out with 13 crucial adventure abilities, which help you fight, run away, and retain your mental stability when the horrors come knocking.

Also included, for gamemasters:

• Data on the terrifying world of the Esoterrorists, and the Ordo Veritatis, the benevolent global conspiracy that fights them
• Creatures of unremitting horror.
• Detailed instructions on structuring investigative scenarios for the innovative GUMSHOE system
• Advice on bringing those scenarios to life in play
• Operation Slaughterhouse, an advanced example scenario of geopolitical horror