Agent 21 Codebreaker

Race against time Zak's third assignment presents him with unexpected challenges. An unknown bomber is targeting London. After an explosion in the London Underground, it is up to Zak and his team to find out how the terrorist cell operates and who is behind it. But there are few leads and they have no idea where or when the bomber will strike next. When the only witness is shot and falls into a coma before Zak can question him, Zak is back at square one. And he doesn't have much time left...