Season 1
6 episodes
1. The Secret Adversary, Part One
1h 0m · Jul 26, 2015
Tommy and Tuppence have a chance encounter on a train with an agitated young woman who suddenly disappears and never returns to her seat.
2. The Secret Adversary, Part Two
1h 0m · Aug 2, 2015
Tommy and Tuppence go undercover; he as a member of Brown's gang and she as a maid to a potential suspect.
3. The Secret Adversary, Part Three
1h 0m · Aug 9, 2015
The Beresfords search for Jane Finn comes to a close, as they uncover the identity of Mr. Brown.
4. N or M? - Part One
1h 0m · Aug 16, 2015
Tommy is sent on a secret mission to discover the identity of Soviet spy staying at a seaside guest-house; Tuppence refuses to be left behind.
5. N or M? - Part Two
1h 0m · Aug 23, 2015
Tommy and Tuppence turn their attention to their fellow occupants of Sans Souci to find N.
6. N or M? - Part Three
1h 0m · Aug 30, 2015
Tommy has finally found the missing scientist, but they're both being held against their will by M, and still none the wiser as to who N is.