The Big Four Agatha Christie 100th Anniversary Collection

A nice selection with the cover from the 1st edition.
The Big Four is a work of detective fiction by Agatha Christie, first published in 1927. It features Hercule Poirot, Arthur Hastings, and Inspector Japp. A tale of international intrigue and espionage, the Big Four refers to four super-scoundrels who scheme to dominate the world. A Chinese criminal, an American millionaire, a French chemist, and an unknown 'destroyer' make up the team of four. Only the brilliant detective Hercule Poirot stands between them and world domination.