Super Heroes, Super Sleuths and Super villains all come together in Neptune King and the Super Hero, the 30th book in the Neptune King series. Neptune and Shark are rather nonplussed when a man bounds into their office clad in a homemade super hero costume, cape and all and offers his services to help them fight crime. Shark thinks it's a joke, Neptune thinks it is ridiculous and tells him where to go. They think that is the last they will see of him, but to Neptune's annoyance he turns up just as he is about to apprehend a thief and interferes with the capture. Again Neptune puts him in his place in no uncertain terms.Undaunted, the self-styled super hero perseveres wanting to prove Neptune and Shark wrong. Neptune's fear that he would come up against someone truly dangerous as opposed to the bag snatchers and lechers whom he had been dealing with eventuates and he reaches out to them again in desperation after he ends up in hospital severely beaten with multiple fractures and injuries. He has information on Neptune and Shark's nemesis, the super villain Sir Reginald Simpson whom they know is guilty of the murders of Percival Jones and Albert Seinfield and whom they were unable to arrest due to lack of evidence (see The Supernatural Cases of Neptune King). Simpson is extremely rich, dangerous and untouchable and hobnobs with the lawmakers and elite of society.With the hapless super hero incapacitated, Neptune and Shark take over and using his information set out to bring Simpson down, with a little help from a demoted disgruntled ex-chief inspector from Scotland Yard who owed his demotion and the destruction of his marriage to Simpson.