The Labours of Hercules

This is perhaps one of Agatha Christie's lesser known novels.
The premise of the book starts with Hercule Poirot contemplating the origin of his name and the twelve labours of Hercules from Greek mythology.

He then goes on to take twelve cases that are linked in some way (occasionally somewhat tenuously) to those labours.
This is a short story collection, although there are some links through the stories, and each can be read independently. Great if you haven't much time to sit down and read an entire novel.

However, as each story is so short, there isn't the depth and twists and turns characteristic of most of her novels, and I would recommend this book more for Poirot fans rather than as a first taste of Agatha Christie's writing genius.