The book "Opening the Cards" by Agatha Christie

The novel "The Showdown" was first published in 1936. In the novel, along with Hercule Poirot, the investigation is conducted by Ariadne Oliver, Chief Inspector Battle and Colonel Race, whom you have met in other works by Agatha Christie. It all begins at a seemingly ordinary and innocent party. dinner, and then bridge. However, that same evening, for the host, Mr. Chaitanya, everything ends, and for Hercule Poirot and the other three, a complex, but at the same time very unusual investigation begins, to reach the end of which, in addition to the methods typical for them, it was also necessary to master the rules of bridge very well.