Max-Catt is selected for the gruelling assessment programme to join the SAS, where only a fraction of candidates survive the physical and psychological punishment required to pass. The infamous Mountain Phase in the Brecon Beacons quickly exposes weakness — and reveals that one candidate has cheated.

When the deception attracts a ruthless blackmailer, the consequences spiral far beyond the Welsh mountains. The pressure follows the selection course to Belize and into the brutal Jungle Phase, where blackmail, murder and the theft of military weapons plunge the entire training programme into crisis. As suspicion grows, Max is forced into an impossible position, determined to uncover the truth before more lives are lost.

Back in the UK, the danger escalates. A powerful drugs cartel prepares a bold plan to flood Britain with heroin, while a Central American serial killer is dispatched to assassinate Max-Catt. From the Isles of Scilly to the Cornish coast and out into the black Atlantic, murder closes in. Vengeance is in motion — and survival is no longer guaranteed.