Agent 21: Codebreaker, Paperback/Chris Ryan

Special agent Zac Darke is back for his 3rd mission and the stakes have never been so high in this edge-of-your-seat adventure from a real-life SAS hero. An unknown bomber is conducting a terror campaign in London and before Zac can question a teenager who thinks he knows the killer, the boy is shot dead. Can Zac break the code before the bomber strikes again?