From the back cover:
A plea for help.
The strike of sudden madness.
Fear forms where shadows begin. The Cthulhu Mythos hovers at the edges of reason and sanity. With their courage and intelligence, investigators can dare the unknown and the unknowable, and roll back a little of the darkness.
Three new mysteries lure the investigators into the penumbra of the Mythos. Each adventure is sanity- and life-threatening, but also includes much evidence-gathering and serves to promote discussion and generous teamwork. The scenarios are apt for new investigators. Each can be played through in an evening or two.
The many illustrations and maps, and their more than forty handouts make these adventures unusually accessible and easy to present.