: David Budd (Richard Madden), a war veteran suffering from PTSD, is assigned as a Principal Protection Officer (PPO) for the ambitious Home Secretary, Julia Montague (Keeley Hawes).

: Budd loathes Montague's hawkish political stance—specifically her support for the wars he fought in—leaving him torn between his duty to protect her and his own personal beliefs.

Created by Jed Mercurio ( Line of Duty ), the show is a six-part political thriller.

: The series explores government surveillance, counter-terrorism, and the psychological impact of war.