There are 5 books in the Tommy and Tuppence Mysteries series. The newest book is Postern of Fate which came out in 1973.

1
The Secret Adversary

Book cover of The Secret Adversary

In the Prologue, a man aboard the RMS Lusitania on 7 May 1915 quietly gives important papers to a young American woman, as she is more likely to survive the sinking ship.
In 1919 London, demobilised soldier Tommy Beresford meets war volunteer Prudence "Tuppence" Cowley, both out of work and…

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Six short stories from the Queen of Crime, featuring our favourite young detectives, Tommy and Tuppence.

Tommy and Tuppence Beresford were restless for adventure, so when they were asked to take over Blunt's International Detective Agency, they leapt at the chance.

After their triumphant recovery of a pink pearl, intriguing…

3
N or M?

Book cover of N or M?

Another audiobook in the Tommy & Tuppence series.

It is World War II, and while the RAF struggles to keep the Luftwaffe at bay, Britain faces an even more sinister threat from 'the enemy within' - Nazis posing as ordinary citizens.

With pressure mounting, the Intelligence service appoints two unlikely…

5
Postern of Fate

Postern of Fate

The final Tommy & Tuppence novel.

Tommy and Tuppence Beresford have just become the proud owners of an old house in an English village. Along with the property, they have inherited some worthless bric-a-brac, including a collection of antique books. While rustling through a copy of The Black Arrow, Tuppence…