An Agatha Christie murder mystery, complete with the requisite country house, genteel manners and a plethora of terribly proper suspects who you just know have all got something to hide. A group of gay young things (in the old-fashioned sense) gather for a weekend house party, and decide to play a practical joke on one of their friends. But when the young man is found dead in his bed next morning, it's apparent there's mischief afoot. The plot thickens when it emerges that the victim wrote a mysterious, clue-laden letter before his death. A good old-fashioned mystery.