Hathaway has been promoted to Inspector after an extended break from the force, and Lewis is enjoying retired life until he's asked to team up with his old colleague again.

It soon becomes obvious that the case has everything to do with Alastair’s failure to save the life of a badly hurt teenager, Nabeel Sira, during surgery. The hospital staff have closed ranks and the boy’s parents are considering their options. A second murder then happens.

After Lewis returns to his old job, he, Hathaway and DS Maddox are swept up in another murder investigation when an American classics student is killed.

After a difficult start, Lewis and Hathaway's partnership seems to have gained some semblance of normality. DS Maddox has become a part of the team. Her abilities will be put to the test when an investigation begins on the brutal murder of an American classics student Rose Anderson Her body is hauled from the canal with a stand wound to the neck and abdomen. Suspicious soon fall on astrophysics professor, Felix Garwood who had recently broken off an affair with Rose. However, Felix was married to Rose's supervisor, Philippa Garwood. Could the jealous wife have committed such a murder?

Lewis' reputation is jeopardized when the very first case that he solved as a DI is reopened for appeal and new murders are committed with the original weapon.

Hathaway and Maddox continue to investigate the murder of Travis as the trail leads back to Lewis’s original case. The two detectives attempt to prevent another murder and Lewis sees himself isolated and alone with his reputation in jeopardy.