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N or M?: Part 1 

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.


Edward Hall


Claire Wilson




Episode cast overview, first billed only:
Danny Lee Wynter Danny Lee Wynter ... Gilbert Worthing
Hannah Waddingham ... Blonde Assassin
Jessica Raine ... Tuppence Beresford
David Walliams ... Tommy Beresford
James Fleet ... Carter
Tam Williams Tam Williams ... Harrison
Saffron Hocking ... Teller
Trevor Cooper ... Mr Harrison
Susan Brown ... Mrs Harrison
Matthew Steer ... Albert
Joanna Horton Joanna Horton ... Barbara Kemp
Josh Cook Josh Cook ... Dennis Harrison
Paul Cawley ... Shopkeeper
David Moorst ... Wilfred
Aoife McMahon ... Sheila Perenna


Nuclear physicist Gilbert Worthing is abducted from a Norfolk RAF base along with secrets vital to national security. Carter gets Tommy to link up with agent Harrison but he is murdered by a hit-woman who also pursues Tuppence. Harrison's dying words concern N and M, two Russian spies, and lead Tommy to the Sans Souci hotel on the Norfolk coast where Gilbert was staying, to unmask the traitors. He is followed by Tuppence and together they meet a group of likely suspects including the glamorous Mrs Sprot, cocky young Carl Denim and two military types, Commander Haydock and Major Khan, the latter challenging Tuppence. Written by don @ minifie-1

Plot Summary | Add Synopsis


Crime | Drama | Mystery


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Release Date:

16 August 2015 (UK) See more »

Company Credits

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Technical Specs




Aspect Ratio:

1.78 : 1
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Did You Know?


In the original novel, the man claiming to be Carl van Deinim is actually an impostor, who had assumed Carl's identity in order to leave Germany after Carl had committed suicide by gunshot. See more »


As Gilbert drives the truck away from the base in the opening scenes, the sound of the engine is clearly that of a modern turbocharged diesel engine. See more »

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User Reviews

Um, where was the mystery?
17 February 2016 | by mshavzinSee all my reviews

This wasn't a mystery. It was a comedy, with some spy stuff. Agatha Christie did not write sit coms. Besides, who needs yet another snarky girl/abused guy cop pairing? I think people are growing tired of them. The only mystery I noticed was why England was involved int he Cold War. The Cold War was between America, and Russia. Maybe China….but NOT England. Also, I really hated the female lead. She just grated on my nerves. She was worse then the completely illogical off the wall story. She was worse then the wooden characters. Its a slap stick comedy that used Agatha Christies name to try and get a few extra viewers, and paid the price. What makes me sad is that I was expecting to like it. I loved the ITV Marple and Poirot series, and I was hoping for something similar. Because that is what Agatha Christie wrote. MYSTERIES. Not snarky man hating hat girl and her beaten down idiot of a husband chasing spies for no reason. At least you would think that after she endangered the operation for the fifth time,. the weird scientist would have fired her.

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