Ep 1. 1. The Secret Adversary, Pt. 1

In the first episode of Agatha Christie's Partners In Crime, entitled "The Secret Adversary, Pt. 1," viewers are introduced to the husband and wife detective duo, Tommy and Tuppence Beresford. Based on the novel of the same name by Agatha Christie, the show is set in 1950s England and features the Beresfords taking on a variety of cases.

The episode begins with Tommy (played by David Walliams) returning home from World War II and struggling to find work. He is reunited with Tuppence (played by Jessica Raine), an old acquaintance from his younger days, at a job fair. With no other prospects in sight, the two decide to start their own detective agency.

Their first case comes to them by chance when they meet a mysterious woman on a train. The woman, Jane Finn, tells them that she is in possession of a document that is vital to the country's national security. However, before she can reveal anything else, she disappears.

Tommy and Tuppence are determined to find Jane Finn and the missing document, and the majority of the episode revolves around their attempts to gather information. Their search takes them to various locations including a hotel and a dance club, where they encounter a variety of colorful characters.

Throughout the episode, it becomes clear that Tommy and Tuppence are very different people. Tommy is more reserved and analytical, while Tuppence is outgoing and impulsive. They bicker frequently but always manage to work together towards their common goal.

In addition to their search for Jane Finn, the episode also introduces some ongoing subplots. There is a mysterious figure known only as "Mr. Brown" who appears to be connected to the case, as well as a reporter who is determined to expose Tommy and Tuppence as frauds.

Overall, "The Secret Adversary, Pt. 1" provides an engaging introduction to the world of Tommy and Tuppence. The mystery is intriguing and the characters are likable, paving the way for an enjoyable season to come.