London, present day. A young girl sets out to find her little brother, kidnapped by a mysterious masked man against whom the police seem powerless. By questioning her family's "godfather," the influential gang leader Mr. Hyde, she learns that a kind of non-aggression pact prevents certain so-called "immortal" beings from interfering in the affairs of others, and therefore he cannot help her. However, he gives her the address of a private detective specializing in the supernatural : Jack Griffin. He turns out to be a former scientist who has discovered a way to become invisible ! He cannot regain his physical appearance, but he can use his powers to help some mortals fight forces against which they would normally be helpless. Thus begins a very dangerous investigation in the supernatural underbelly of the British capital, home to many unique creatures and belligerent beings... but nothing that can frighten the Invisible Man !
