'The Bizarre Cases of Neptune King is the 13th book in the series and in this they most definitely encounter the outré. Still banned from Scotland Yard by Commissioner Talbot, Shark undertakes an investigation into a missing man, only to learn that he has become a victim of a murderer that the newspapers are calling The Camden Cannibal because he eats his victims, only disposing of the head, hands, and the remnants of his cooking. Neptune is itching to tackle this case and his chance comes when the editor of The Times hires them to investigate independently of the police. This they do with their usual thoroughness and are close on the trail of the cannibal when Talbot issues the cannibal a challenge to eat him! It's too good an opportunity for the cannibal and he abducts the commissioner. Shark and Neptune come to the rescue, but almost become the Sunday dinner in the process.
'In The Case of the Lovesick Necrophile, they are called upon to investigate why a recently young deceased woman keeps getting violated at the funeral parlour. It all comes to a head when Marjorie's body is stolen from her grave. With the Necrophiliac located and on the run, the chase is on to catch him. Unfortunately for Becky, he's seen her and is smitten by her and decides if he can't have Marjorie he'll get himself a new body. She's no good to him alive. Can Neptune and Shark stop him before he can fulfil his sick and twisted fantasies? Start reading and find out.' (Publication summary)