The Secret Of Chimneys

S5 E2: When Miss Marple accompanies Lady Virginia Revel to a weekend party at country estate Chimneys, she finds herself in the middle of an important diplomatic gathering. The strange array of guests clashes over dinner and that night Count Ludwig of Austria is found dead. When Miss Marple and Chief Inspector Finch discover a coded message she realises the secret of Chimneys is even darker than she imagined.