CIA agent Caitlyn Valentine has disappeared in London and James Flynn is sure she's in danger.
Of course, as a heavily medicated patient in a Pasadena psychiatric hospital, no one takes Flynn seriously. Especially since he's convinced his locked ward is the headquarters for His Majesty's Secret Service and that he's an international superspy with a license to kill.
Flynn escapes and makes his way to a totally unfamiliar London with the help of his reluctant sidekick and psychiatric nurse, Sancho. From a luxurious private casino in Mayfair to the superyacht of a Russian oligarch to the Orient Express and the Hôtel de Paris in Monte Carlo, Flynn follows Caitlyn's trail and stumbles upon an audacious plot that threatens every country on Earth. At least that's how it seems to a man teetering between objective truth and absolute insanity.