Felidae is a 1989 novel by German-Turkish writer Akif Pirinçci. The main character is a cat named Francis who investigates the murders of several cats in a big city in an unspecified western country. There are currently 6 books in the Felidae series: Felidae, Felidae II (also known as Felidae on the Road or, in the original German version, Francis), Cave Canem, Das Duell, Salve Roma and Schandtat of which only the first 2 have been translated into English. Although being primarily a work of crime fiction, the Felidae series discuss many contemporary ethical problems and philosophical questions, one of them being the relationship between mankind and animals. Thus, the Felidae series are more complex and multi-layered than many contemporary crime novels.