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Tommy has finally found the missing scientist, Gilbert Worthing, but they are both being held against their will at Commander Haydock's, and we're still none the wiser as to who N really is. It turns out that Gilbert managed to hide a vital key to his device before his capture, and that without it the bomb N and Haydock have stolen is entirely useless. So when Tuppence storms Haydock's house and helps Tommy and Gilbert to escape, it seems like the only thing left to do is retrieve the key from the strange place Gilbert hid it.
Tommy and Tuppence think they are getting somewhere until their first major suspect Major Khan is killed at the local Veterans Ball. It turns out Khan was looking for N too, for a different reason, and N got to him first. And so Tommy and Tuppence turn their attention to their fellow occupants of the Sans Souci to find the potential nuclear bomb thief.
Tommy's uncle, Major Anthony Carter entrust Tommy with a case he must keep completely secret, even from Tuppence. Things get complicated when Tuppence figures out what Tommy is hiding from her.
Tuppence ponders the cryptic message she discovered in the Soho den, and worries about Tommy who, with his cover blown, is being driven to a remote location by Brown's gang.
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- Premiered: July 26, 2015
- Rating: None
- Premise: A married couple in Britain stumble into the world of espionage in this series, which is set at the start of the Cold War. (more)