Call of Cthulhu
Call of Cthulhu is a roleplaying game based on the writings of H.P. Lovecraft, in which the player characters are more or less normal people such as journalists, academics, dilettantes, detectives. They try to find the truth of all existence. In the course of their investigations, the players might find themselves fighting horrors from beyond space, cosmic horrors such as the Great Old Ones, and the madmen that serve them.
Call of Cthulhu is the definitive horror roleplaying game.