A month later, Japp informs Poirot of another mysterious death—that of chess grandmaster Gilmour Wilson, who collapsed and died from heart failure while participating in a match with another player, Doctor Savaronoff. Japp suspects he was poisoned and that the poison was intended for Savaronoff, a former Revolutionist in Russia who escaped from the Bolsheviks and was believed to have died during the revolution until his arrival in England. He previously refused several times to play a game of chess with Wilson, but eventually gave in. The match took place in Savaronoff's flat, with at least a dozen people watching the game.