from the back of the book
The first sourcebook for Cthulhu Live, Second Edition, Lost Souls explores the horrors of the Cthulhu Mythos from the perspective of the pulp and noir genres. As two-fisted pulp avengers, deadly femme fatales, and cynical gumshoe detectives, the players match their wits against the forces of darkness.
From the steaming jungles of the 1920s to the mean streets of the 1950s, Shades of Gray gives you everything you need to run live-action horror adventures in the worlds of pulp fiction and film noir: genre conventions, character types, and interaction with the horrors of H.P. Lovecraft;s Cthulhu Mythos. In conjunction with the pulp and noir genres, Shades of Gray also introduces elements of Pagan Publishing's acclaimed Delta Green campaign for use in your Cthulhu Live game.