I love Christmas mysteries, and I especially love the narrow sub-genre of the English country house murder mystery, which includes Hercule Poirot's Christmas and The Adventure of The Christmas Pudding by Agatha Christie, The Santa Klaus Murder by Mavis Doriel Hay, and Mystery in White by J. Jefferson Farjeon, as well as this one.
Originally titled Envious Casca, somewhere along the way the publisher realized that people really love mysteries set over the Christmas holidays, so the book was repackaged with a fantastic cover and republished for a new generation of readers.
I've enjoyed this one more with subsequent readings, in spite of the fact that I know whodunnit. This is definitely a book to take to any holiday gathering that involves members of your family that are difficult to deal with - Heyer's acid pen and her descriptions of the brutal verbal sparring between the members of the Herriard family make dealings with passive-agressive mothers-in-law and #MAGA-inspired uncles seem like child's play by comparison.
And hey, if you manage to get yourself home without murdering, being murdered, or witnessing a murder, it's all good!