N or M?

N or M?

Dust-jacket illustration of the US (true first) edition. See Publication history (below) for UK first edition jacket image.
Author Agatha Christie
Country United Kingdom
Language English
Genre Crime novel
Publisher Dodd, Mead and Company
Publication date
Media type Print (hardback & paperback)
Pages 289 pp (first edition, hardback)
ISBN 0-425-09845-1
Preceded by Evil Under the Sun
Followed by The Body in the Library

N or M? is a work of detective fiction by Agatha Christie first published in the US by Dodd, Mead and Company in 1941[1][2] and in the UK by the Collins Crime Club in November of the same year.[3] The US edition retailed $2.00[2] and the UK edition at seven shillings and sixpence (7/6).[3]

The title is taken from a catechism in the Book of Common Prayer which asks, "What is your Christian name? Answer N. or M."[4] The "N. or M." here stands for the Latin, "nomen vel nomina", meaning "name or names". It is an accident of typography that "nomina" came to be represented by "m".

The novel is the first to feature the mature versions of her detectives Tommy and Tuppence, whose previous appearances had been in the adventure The Secret Adversary (1922) and the short story collection Partners in Crime (1929).

Plot introduction

After the outbreak of the Second World War and many years after they worked for British intelligence, Tommy and Tuppence Beresford feel useless and sidelined. When Tommy alone is approached to go undercover once more, however, Tuppence decides to join him on his mission whether invited or not. Through good sleuthing she learns where he is to be sent and actually arrives there before him. They begin a search for German fifth columnists. Another British agent that was following these Germans left a cryptic message on his deathbed: "N or M. Song Susie". Grant knew that "Song Susie" stood for Sans Souci, a hotel in (fictional) seaside Leahampton, based on Bournemouth; "N" and "M" were two German spies, one male and one female. Tommy is to go to Sans Souci to investigate whether N, M or both are at the hotel and to figure out their identities.

Both N and M's identities are revealed at the end of the book; "N" is a top German spy—who is shot by British intelligence at the book's conclusion as he threatens Tuppence's life—and "M" is his female co-conspirator.

Literary significance and reception

Maurice Willson Disher's review in The Times Literary Supplement of 29 November 1941 began, "To believe that N or M? is not Miss Agatha Christie's best is difficult while the first fine anxious rapture of her latest story is still troubling the mind." He concluded, "The point is reached when you begin to fear for your own sanity on catching yourself wondering whether an ingratiating babe-in-arms might not be Herr Doktor in disguise. Yet such is Miss Christie's skill in conjuring up the ominous that even infant prattle sounds uncommonly like a code for the Fifth Column. In other words, as Mr Robey has said before now, N or M? gets you."[5]

Maurice Richardson in a short review in the 7 December 1941 issue of The Observer wrote: "Agatha Christie takes time off from Poirot and the haute cuisine of crime to write a light war-time spy thriller. N or M is [an] unknown master fifth columnist concealed in [the] person of some shabby genteel figure in Bournemouth boarding-house ... Christie's bright young couple, now middle-aged but active as ever, are nearly trapped. Nice surprise finish and all-round entertainment."[6]

A short review by E.R. Punshon in The Guardian of 30 December 1941 ended with "Mrs Christie shows herself as ingenious as ever, and one admires especially the way in which the hero snores himself out of captivity."[7]

Robert Barnard: "The Beresfords contribute their intolerable high spirits to the war effort. Less racist than the earlier thrillers (in fact, some apology is made indirectly) but no more convincing."[8]

MI5 investigation of Christie

Around 1941 or 1942, the British intelligence agency MI5 temporarily investigated Christie herself as she had named one of her characters in this novel as a certain Major Bletchley.[9] MI5 was afraid that Christie had a spy in Britain's top-secret codebreaking centre, Bletchley Park. MI5's fears were eventually assuaged when Christie revealed to Dilly Knox, who helped break the Enigma machine cypher used by German secret service officers sending spies to Britain, that Bletchley was merely the name of "one of my least lovable characters".[9]

TV adaptation

The UK television channel BBC One began airing a 3-part adaptation of "N or M?" on August 16, 2015. The adaptation was aired as part of the Partners in Crime series.

Publication history

Dustjacket illustration of the UK First Edition (Book was first published in the US)

The novel first appeared in the US in a condensed version in the March 1941 (Volume 76, Number 5) issue of Redbook magazine with an illustration by Alan Haemer.

In the UK, an abridged version was serialized in seven parts in Woman's Pictorial from 26 April (Volume 41, Number 1059) to 7 June 1941 (Volume 41, Number 1065) under the title Secret Adventure. All the installments were illustrated by Clive Uptton.


  1. John Cooper and B.A. Pyke. Detective Fiction – the collector's guide: Second Edition (pp. 82, 87) Scholar Press. 1994; ISBN 0-85967-991-8
  2. 1 2 "American Tribute to Agatha Christie"
  3. 1 2 Chris Peers, Ralph Spurrier and Jamie Sturgeon. Collins Crime Club – A checklist of First Editions. Dragonby Press (Second Edition), March 1999 (p. 15)
  5. The Times Literary Supplement, 29 November 1941 (p. 589)
  6. The Observer, 7 December 1941 (p. 3)
  7. The Guardian, 30 December 1941 (p. 3)
  8. Barnard, Robert. A Talent to Deceive – an appreciation of Agatha Christie (revised edition; p. 193). Fontana Books, 1990; ISBN 0-00-637474-3
  9. 1 2 Richard Norton-Taylor (4 February 2013), Agatha Christie was investigated by MI5 over Bletchley Park mystery, The Guardian, retrieved 29 March 2013
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