Three Act Tragedy

Thirteen guests sit down to dinner at an actor's house. The evening turns unlucky for the gentle Reverend Stephen Babbington, who chokes on his cocktail, falls into convulsions and dies.

When the martini glass is sent for chemical analysis, the laboratory finds no poison at all, exactly as Poirot had predicted. What troubles the great detective even more is that nobody seems to have had any reason to want the clergyman dead.