come to London to take up a position on the London Times. He proves his usefulness by sending them new clients, which is fortuitous as Neptune is broke, having paid his entire fortune to Shadow as ransom for his sister and Shark. Their first case sees them initiated into a cult, hypnotizing and using the followers for the leader's enrichment. Unable to afford petrol for his car, Neptune borrows twenty pounds from Shark only to see his own initials on the note. NK in the right hand corner. Every note in the ransom bundle was similarly marked. Following the trail of the money leads them to...

The Charity Cases of Neptune King is the twentieth book in the series. While Shark prefers to have paying customers, Neptune, always the soft touch doesn't mind undertaking investigations for those that can't pay. The first case, The Money Trail sees pathetic little Nancy Potts come to them willing to pay them her entire life savings of 20 pounds to find the unrequited love of her life, Jim Rudford, who quit his job after being tricked into thinking he was dying of a rare disease. She is afraid he will do something drastic, which he does. The same day he gets his death sentence he also learns...