The Secret Adversary

In 1919, young couple Tommy Beresford and Tuppence Cowley establish themselves as "young adventurers" and take on their first case involving top-secret documents that could incite a communist revolution in Britain. As they delve into the mystery of Jane Finn's disappearance and uncover dangerous secrets, they find themselves increasingly threatened by a killer targeting a woman with crucial knowledge. Their adventure quickly turns into a perilous pursuit, putting them in grave danger.