The Secret Adversary

Set in the aftermath of World War I, two childhood friends, Tommy and Tuppence, embark on a thrilling adventure as they launch their business, The Young Adventurers. Their journey begins when they are hired for a mysterious job, plunging them into perilous situations and introducing them to a cast of intriguing characters, including an American millionaire searching for his missing cousin. This novel marks the beginning of their escapades, which continue across multiple stories throughout Agatha Christie's career.