 In 1987 the play ran in the Arena Players Main Stage Theater in East Farmingdale, New York, and in May 2009 it premiered with an international cast in Luxembourg's Abbaye de Neumunster.The play tells the story of Karl Hendryk, a brilliant professor who, with his wife and her cousin, have fled persecution in their country.It is not explicitly mentioned that they are Germans persecuted by Nazis – and Agatha Christie has probably deliberately given the characters names that are not evidently traceable to any national origin.