Winter 2019. Twenty-three years after the ultra-secret terrorist organization Sons of Jihad was exposed and its headquarters in Beirut destroyed, the group strikes again. Its few surviving agents, having infiltrated the West, unleash a series of devastating attacks in the heart of London, forcing British Security Services to confront the looming threat they failed to eliminate.

MI5 agents Adrian Frost and Jemma Stone, leaders of the task force tracking the elusive sleeper agents, find themselves ensnared in a treacherous web of terror and espionage. When the foremost sleeper agent infiltrates one of the most sensitive and powerful positions within British security, Frost and Stone are framed – set up to take the fall.

As a brutal assault on the British monarchy and the nation’s currency throws London into chaos, the government teeters on the brink of collapse. Meanwhile, the Kremlin lurks, ready to seize the moment and shift the balance of power in Europe.

Accused of sabotage and treason, Frost and Stone are flung into no-man’s land. With few allies and even fewer resources, they must do whatever it takes to uncover the truth, expose the sleepers, and save their homeland before it’s too late.