Danny Watts' grandfather, Fergus, was a Deniable Operator in the SAS before he was betrayed, imprisoned, and falsely denounced as a traitor. Now Fergus has escaped, but the real traitor is determined to silence Fergus and Danny for good. Together Danny and Fergus are forced to go on the run in an against-the-odds battle for survival. As they try to clear Fergus' name, Danny learns all the military field craft, trade skills, and covert operations techniques that are second nature to his grandfather. When Fergus is recaptured, Danny must put those skills to the test and rescue Fergus before it's too late.

A series of high-profile suicide bombings are devastating London and frustrating British Intelligence. But that doesn't matter to seventeen-year-old Danny Watts and his former SAS hero grandfather, Fergus, who are living undercover in southern Spain, knowing that the slightest slip could expose their whereabouts to the ruthless killers on their trail. All too soon, Danny and Fergus have their cover blown and are on the run again, with their enemies closing in fast. Suddenly, Danny and Fergus are forced to return to London and clear the family name. But once back in the UK, it appears that Danny is somehow connected to the bombings, and now they both must struggle to bring the truth to light before it's too late for payback.

Danny and Elena are now working for the Firm, desperately attempting to track down the vengeance-seeking Black Star before more 'Angels of Death' suicide bombers are despatched. Elena is the key to discovering the bomb-master's whereabouts as she has already made Deep Web contact. The plan is simple - locate Black Star and kill him - at whatever cost. While Fergus is forced to remain in England, confined to a wheelchair as he recovers from his injuries, the hunt takes Danny and Elena to New York on a covert mission led by Marcie Deveraux. Despite Black Star's trickery and deception, the net gradually closes. Fergus travels to the US to help, but Elena is drawn into terrible danger, and only Danny can save her. Using the skills his grandfather has taught him and his own initiative, he must stop the avenging bomb-master from wreaking further destruction . . .

A lethal new drug with devastating side effects, known as Meltdown, is threatening to destabilize society. Dudley knows that the security services have to act fast, and when his 4 x 4 arrives at their remote hideout in the Canadian lakes, eighteen-year-old Danny and his grandfather, ex-SAS hero Fergus Watts, are once again sucked into a deadly undercover operation and a race against time. Their search for the mastermind behind a pair of murderous gangland twins takes them from the clubs of Manchester to Spain and Germany, and Danny needs all his newly learned expertise when he comes up against an old adversary - someone he hoped never to encounter again. And this time, when the battle is joined, it is a battle to the end.