Some authors just write about it. Chris Ryan has been there, done it, and lived to tell the tale. This is the second in the new action-thriller "Agent 21" series by the real-life SAS hero. In the year since Zak Darke was approached by a shadowy government agency to become Agent 21, his world has changed completely. But there is no time to reflect on this - the undercover operations go on. Zak is sent to a port in west Africa, a known terrorist stronghold, under the guise of working on a charity volunteer project. But charity work could not be further from Zak's real mission - he must sneak onboard an enemy ship, gather information - and then destroy it. Never has Zak's training been more useful: Trust nobody.