Reunited in 1919 London, demobilised soldier Tommy Beresford and nurse Prudence "Tuppence" Cowley, out of work and money, form the "The Young Adventurers, Ltd." planning to hiring themselves out as "adventurers … [w]illing to do anything, go anywhere … [n]o unreasonable offer refused." They are overheard by a Mr. Whittington who offers Tuppence a comfortable position, but he is shocked when she randomly gives her name as "Jane Finn", a name Tommy in turn had overheard him use and mentioned during the same conversation. Whittington believes Tuppence is blackmailing him and sends her away with some money. Convinced that they can get further money out of Whittington if they play their cards right, Tommy and Tuppence prepare to shadow him, only to discover that he has closed his office and dis