E-book exclusive extras:

1) Christie biographer Charles Osborne's essay on The Labours of Hercules;

2) "The Poirots": the complete guide to all the cases of the great Belgian detective.

In appearance Hercule Poirot hardly resembled an ancient Greek hero. Yet – reasoned the detective – like Hercules he had been responsible for ridding society of some of its most unpleasant monsters.

So, in the period leading up to his retirement, Poirot made up his mind to accept just twelve more cases: his self-imposed ‘Labours’. Each would go down in the annals of crime as a heroic feat of deduction.

[Hercule Poirot 58 - 69]