Big Four by Agatha Christie.

I should state at the very beginning that this is one of the worst Poirot mysteries from Christie.

Poirot is up against "Big Four" comprising of a China man, an American millionaire, a french scientist and a mysterious "destroyer". The Big Four is set upon capturing the power of the entire world and Poirot ,equipped with his order, method and little grey cells are figting agaist them. This is not a single mystery but rather a thriller with a series of mysteries which are solved by Poirot, accompanied by Captain Hastings. Inspector Japp also makes appearance in the story.

Certainly lacks the Christie magic but still makes a decent read if your expectations are not set high. 2.5 out of 5.