Call of Cthulhu Roleplaying Game (d20)

Really very good in most respects. The only drawback to this book is that the amount of work and detail put into d20 character creation (as well as the system's emphasis on level advancement) make it less compatible with the high rate of character insanity and death that is traditional in the standard Call of Cthulhu game. Still, if you like the setting but want to hang on to your character for more than one session, this can be the perfect alternative.