For Fans of Bodyguard

Before Bodyguard, Mercurio had already reinvented the British cop procedural with Line of Duty's internal-affairs conceit. Bodyguard took that same formula for extracting maximum suspicion from a confined cast and applied it to the protection racket around a polarising politician. The result was the most-watched BBC drama in over a decade. What made it land was not the twist (though the twist delivered) but the cumulative claustrophobia: every scene reminded you that Budd's PTSD and his professional duty were on a collision course, and the show refused to hurry either.

David Budd's PTSD is not window dressing. The show builds its central ambiguity around a man whose combat reflexes are entirely real but whose interpretation of what he is seeing is permanently in doubt. That is a sharper political statement than most British dramas dare: the soldiers sent to fight contested wars come home with skills a government then exploits, while leaving the psychological bill unpaid. Line of Duty's Ted Hastings operates in the same moral universe: loyalty to an institution that may not deserve it.

Mick Herron's Slough House novels, now adapted for Apple TV, are the hangover to Bodyguard's adrenaline. Where Bodyguard keeps its protagonist at the sharp end, Herron populates his world with the people who got things wrong once and were quietly shelved. The bureaucratic cruelty is as suspenseful as any car chase, and Gary Oldman's Jackson Lamb is the anti-Budd: slovenly, ruthless, and still, somehow, right. Read the books first.

Bodyguard sits in a tradition that John le Carre built over decades: the thriller as a critique of the state that commissions it. Tinker Tailor Soldier Spy and The Spy Who Came in from the Cold are not adventure stories. They are slow, painful demonstrations that loyalty to a cause does not protect you from the people running it. If Bodyguard's central question (can a compromised man protect a system worth protecting?) gripped you, le Carre's novels are the full-length version of that argument, written from the inside.