When Zak Darke's parents die in an unexplained mass murder he's left alone in the world. That is until he's sought out by a mysterious man: ‘I work for a government agency,’ the man tells him. ‘You don’t need to know which one. Not yet. All you need to know is that we’ve had our eye on you. There’s a possibility you could help us in certain . . . operational situations.’ Zak becomes Agent 21. What happened to the 20 agents before him he'll never know. What he does know is that his life is about to change for ever . . .

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 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 ona 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.

Secret agent Zak Darke is back for his third mission - and the stakes have never been higher. An unknown bomber is conducting a terror campaign in London. After an explosion on the tube leaves someone dead, Zak and his team are brought in to try and work out how this terror cell operates - but clues are scarce and they have no idea where, or when, the bomber will strike next. A teenage boy, currently detained in a young offender's institute, claims he has the answer - but before Zak can question him, the boy is shot and falls into a coma. Will Zak be able to break the cipher before the bomber strikes again?

Working for a shadowy government agency, teenage special agent Zak Darke goes undercover to infiltrate a dangerous gang of fifteen-year-old gun dealers. But while the gang members may be young, they aren’t so easily fooled. Has Agent 21 made his last mistake?

Zak Darke is sent on what seems like a straightforward surveillance op in South Africa but it soon turns into the toughest, most dangerous mission he has ever faced. An old enemy has teamed up with a terrifying gang of child soldiers and Zak is caught in the middle. Having travelled to the heart of the African jungle, will he make it out alive . . . ?

Ricky has lived on the streets for a while now. Life is tough, but he's sharp and quick, and he gets by. Until he steals from the wrong people... Luckily for him he is rescued by a stranger who makes him an offer he can't refuse: a flat and money in exchange for learning certain skills - surveillance techniques and hand-to-hand combat. But what is this all for? Ricky is about to find out...

'Don’t come after us … remember the first thing I ever taught you - that your first duty is to stay alive' For some time now, Zack Darke has been operating solo, in total secrecy, for a shadowy government organisation. When his handlers are abducted by somebody with a serious personal vendetta against him, Zak has no choice but to go after them. And heading across the world to find them - into danger like he's never known - is something that, this time, he cannot do alone . . .