The Secret Adversary Agatha Christie - The Secret Adversary is the second published detective fiction novel by British writer Agatha Christie, first published in January 1922 in the United Kingdom by The Bodley Head and in the United States by Dodd, Mead and Company later in that same year. Hiring themselves out as "young adventurers willing to do anything" is a smart move for Tommy and Tuppence. All Tuppence has to do is take an all-expenses-paid trip to Paris and pose as someone named Jane Finn. But with the job comes a threat to her life, and the disappearance of her mysterious employer. Now Tuppence's newest job is playing detective?because if there's a Jane Finn that really exists, she's got a secret that's putting both their lives in danger.