Piet Hoffman, a top secret operative for the Swedish police, is about to embark on his most dangerous assignment yet: after years spent infiltrating the Polish mafia, he's become a key player in their attempt to take over amphetamine distribution inside Sweden's prisons. To stop them from succeeding, he will have to go deep cover, posing as a prisoner inside the country's most notorious jail. But when a botched drug deal involving Hoffman results in a murder, the investigation is assigned to the brilliant but haunted Detective Inspector Ewert Grens--a man who never gives up until he's cracked the case. Grens's determination to find the killer not only threatens to expose Hoffman's true identity-it may reveal even bigger crimes involving the highest levels of power. And there are people who will do anything to stop him from discovering the truth.