The series features the eponymous character, a paranormal investigator who takes on cases involving supernatural elements such as ghosts, demons, vampires, undeads, werewolves and other creatures, but also horrifying sociopathic criminals and serial killers. It defies the whole preceding horror tradition with a vein of surrealism and an anti-bourgeois rhetoric. Dylan is supported mainly by his trusty sidekick Groucho (a Groucho Marx lookalike) who adds humour to this grisly genre and Dylan's sombre temperament. The series is mainly set in London, where the protagonist lives, though he occasionally travels elsewhere.