The Secret Adversary (Tommy and Tuppence #1), Agatha Christie
Set in 1919 London, Tommy and Tuppence, experiencing unemployment and shortage of money. They form a partnership, hiring themselves out as “young adventurers”. They are overhead by Mr. Whittington who follows Tuppence to offer her a position. However, when Tuppence gives her name as “Jane Finn”, he is shocked and…