Trail of Cthulhu is a complete game of investigative horror set in the 1930s based on the work of HP Lovecraft. The game uses an adpated and enlarged version of GUMSHOE system which offers a laser-like focus on investigation, with characters driven to explore and investigate, even at the expense of their own health and sanity. Written by Kenneth Hite, it is Pelgrane Press's most ambitious project to date.