U.S. police chief Bill Hixon lands in the British town of Boston, Lincolnshire, with his 14-year-old daughter Kelsey in tow hoping they can flee their painful recent past. But this unfamiliar, unimpressed community will force Bill to question everything about himself and leave him asking whether it's Boston that needs Bill, or Bill that needs Boston?

Set in the leafy suburbs of 1950s London, the Beresfords find themselves in need of some adventure in their lives. With Tommy undertaking a variety of business opportunities, and Tuppence trying to dissuade him, the couple find themselves in the wrong place at the right time to solve a mystery - or two - and perhaps save someone's life. They are about to enter a world of espionage and skulduggery guided by Tommy's mysterious Uncle, Major Carter. It is a world which will prove easier to enter than to leave.