Ngaio Marsh was one of the queens (she has been called the empress) of England's Golden Age of mystery fiction. And in true Golden Age fashion, her oeuvre opens with, yes, a country-house party between the two world wars - servants bustling, gin flowing, the gentlemen in dinner jackets, the ladies all slink and smolder. Even more delicious: The host, Sir Hubert Handesley, has invented a new and especially exciting version of that beloved parlor entertainment, The Murder Game.