From the introduction "Welcome to Cathulhu (say cat-thoo-loo), an alternative setting which approaches Call of Cthulhu from a cat's-eye view! These additional rules connect the traditional Call of Cthulhu RPG with a feline milieu inspired by Akif Pirincci's Felidae and other novels." A sub-genre rule expansion for Call of Cthulhu. User notes The German version was re-released in October 2013 as a pdf. It includes all rules, character sheets and two additional adventures: Die Spur der Schwarzen Katzen (The trail of the black cats) by Ingo Ahrens Der Fluch des Rattenwesens (The curse of the rat creature) by Frank Heller