This is the 15th book in the series with three new and challenging cases for the detectives to solve. In The Case of the Crooked Politician, Shark's father-in-law comes to him with a concern that one of his colleagues - the minister for Immigration is extorting money from desperate migrants. The investigation turns out to be a family affair as Shark enlists the aid of his mother, who is still waiting to find out about her own citizenship applications, to help trap the dishonest politician. Once again his little sister Suzy gets involved and shows her courage, mettle and natural aptitude for detective work. In The Case of the Oxford Terror, Neptune is once again back at Oxford University as a teacher, and Shark goes undercover as a student. This time Neptune is more than a match for the crotchety old professors who made his life hell when he was there before, and is more comfortable teaching. Two professors have been attacked, the art teacher humiliated and the rowing team coach viciously assaulted. They hope that by blending in they'll be able to catch the culprit, but not before he strikes again and a student is murdered. In The Case of the Uncertain Killer, young Aysha Daniels comes to them terrified that her father is a murderer as every man she has ever gone out with has ended up dead. The father's behaviour is certainly suspicious, but what their investigation turns up surprises even them.