Thatcher's a detective, not a codebreaker...The body of a war hero washes up on the riverbank in a small town. Somewhere the majorwouldn't have normally been. DCI Max Thatcher and his partner, DI Mills, are called in toinvestigate. But this goes beyond simply solving a murder.They have to solve codes left behind by the victim. Normally, they would ignore the seeminglyuseless clues, but after talking to his superior officers, they are struggling to find a suspect ormotive. The codes are all Thatcher and Mills have to go on.However, the pair soon discover that there is more to these codes than meets the eye. They aretranscriptions of secret conversations but whether or not they are true will put Thatcher and Millsinto more danger than they originally planned.