Who killed the curate?

Meet Lady Lupin Lorimer Hastings the young, lovely, scatter brained and kind-hearted newlywed wife to Andrew, the vicar of St Marks parish in Glanville, Sussex. When it comes to matters clerical, she is rather at sea. Nevertheless, she is determined to make her husband proud of her or at least not to embarrass him too badly. When, on Christmas Eve, Andrew's unpopular, blackmailing curate gets himself murdered, things all get a bit (hilariously) overwhelming for poor out-of-her-depth Lady Lupin. Lupin enlists old society pals Duds and Tommy Lethbridge, as well as Andrew's nephew, a British secret service agent, to get to the truth.