Principal Protection Officer David Budd has made a major breakthrough in the investigation into the attack on the Home Secretary, but his enquiries have put him in mortal danger. With the clock ticking and no one left who believes him, David attempts to prove his innocence. But the evidence against him begins to stack up...

As he delves into Julia's political manoeuvring, David's theories about a conspiracy at the heart of government look increasingly plausible. But concerns about David's psychological health are raised, and allegations about his and Julia's professional conduct come to light.

The events of the night before play out for the Home Secretary Julia Montague and her Specialist Protection Officer David Budd.

As the capital shudders in the wake of the recent attacks, Specialist Protection Officer PS David Budd is under more pressure than ever to keep the Home Secretary Julia Montague safe.

With the UK terror threat level raised to severe, Home Secretary Julia Montague holds secret meetings with the Director General of the Security Service - freezing out her own Minister for Counter Terrorism and the police, led by Commander Anne Sampson.

After distinguishing himself by courageously neutralising a terrorist threat, troubled war veteran Police Sergeant David Budd of the Metropolitan Police's Royalty and Specialist Protection Branch (RaSP) is assigned as a principal protection officer to the home secretary, the Rt Hon Julia Montague MP. Julia is a controversial politician intent on pushing a new counterterrorism bill through Parliament which would give the security service enhanced surveillance powers. Her political ambitions make Julia a high-profile target. Dedicated to his job but concealing deep resentment of politicians following his traumas in Helmand, David's divided loyalties might make him Julia's greatest threat.