John Sinclair is a fictional character created by German author Jason Dark. He is a detective who specializes in supernatural cases, often battling various forms of evil, including ghosts, vampires, and other creatures. The character first appeared in the 1970s and has since become a popular figure in horror literature. The John Sinclair series consists of numerous novels and comic adaptations, appealing to fans of the horror genre. The stories typically blend mystery and suspense, showcasing Sinclair's adventures as he confronts dark forces while seeking to protect humanity from supernatural threats.