Pocket GUMSHOE

From publisher blurb: GUMSHOE is the system for investigative roleplaying that powers hit games like Trail of Cthulhu, Night's Black Agents, and TimeWatch. Pocket GUMSHOE is a streamlined 32-page version of the core GUMSHOE rules system. Future Pocket GUMSHOE releases will present complete scenarios and pregenerated characters, but you can use the core of Pocket GUMSHOE as a reference for many other GUMSHOE system games as well.