Lytcham Close, one of the oldest stately homes in England, is owned by the last remaining heir and ruled by his intolerable whims. Old Hubert demands complete silence when he plays music and times dinner exactly by a resounding gong. Rushing down at the sound of the second – or is it the first? – gong, Joan Ashby is about to find out that not only is dinner delayed, but something is going on that no one can explain.
Everyone is thrown into disarray when Old Hubert never materializes and instead a new guest is announced: Hercule Poirot himself. What unfolds is a mystery of lovers, and a death that is not as it appears.