探长来访，案件揭开谜团，真相似烟雾缭绕。月影传说

　　Based on a famous stage play and set in the year 1912, an upper crust English family dinner is interrupted by a police inspector who brings news that a girl known to everyone present has died in suspicious circumstances. It seems that any or all of them could have had a hand in her death. But who is the mysterious Inspector and what can he want of them ?