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 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).