It's1952,andTommyandTuppenceBeresford,anordinarymarriedcouple,arethrustintoawebofinternationalespionageafterachanceencounteronareturntrainfromParis.
TommyandTuppence'ssearchforthemissingJaneFinn,Brown'sidentityandtherecordinggetsmoredangerousastheystruggletomaintaintheircover.
Tommy'scoverisblown,andtheviolentcriminalganggivehimajobtodo.Tuppencecomestohisaidastheytrytopreventanassassination.
