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In The Winter Murder Case, Vance is invited to a house party hosted by wealthy Carrington Rexon who is mistrustful of some of his other guests in proximity to his fabulous emerald collection. His suspicions are given extra weight when one of the estate guards is found dead. This final S.S. Van Dine mystery is an improvement over its predecessor, The Gracie Allen Murder Case which, like that book, was written with a specific movie actress in mind--in this case, Olympic skating champion turned movie star Sonja Henie. While there are many scenes involving skating, the winter theme is merely window dressing and doesn't play an appreciable part to the mystery (it easily could be The Summer Murder Case). Nobody is stabbed or has their throat slit with an ice skate (alas!). In addition to the shortness of the novel, the economy of the mystery itself gives The Winter Murder Case the feel of a short story blown up to novella length. A brisk read but inessential to the S.S. Van Dine canon. (The publication is also padded out with Van Dine's Twenty Rules for Writing Detective Stories and it's amusing to see how many of his own rules Van Dine transgresses).
I have now finished all the Van Dine novels (and basically in order. I suspect The Greene Murder Case was the only one I read significantly out of sequence) with my favourite being The Kennel Murder Case. Seeing some of the divergent opinions on that title makes me want to reread it as it's at least ten years since I completed it .