Cards on the Table by Agatha Christie

When the enigmatic Mr. Shaitana hosts an unusual dinner party, he invites four brilliant detectives and four guests rumored to have gotten away with murder. What begins as an intriguing social experiment turns deadly when Shaitana is found stabbed during a quiet game of bridge. With no clear evidence and only behavior and psychology to rely on, Hercule Poirot must dissect motives, tensions, and subtle clues to identify a killer who is clever enough to hide in plain sight.