This author was not known to me, until very recently. I was passing an idle hour on the internet, when it occurred to me to search for films in which there are polygamous characters, or in which polygamy is a theme. ie One of the characters has more than one wife at once. This brought me to a made-for-TV film called "Judge Dee and the Monastery Murders."(1974) This is set in ancient China, and features an investigating magistrate named Judge Dee, who finds himself spending a stormy night, with his three wives, in a remote Taoist monastery. It seems strange things have been going on there--the death of the former Abbot, the death under mysterious circumstances, of three young women who were hoping to become nuns.
Well, I don't recall having seen the film, and I don't know if it's on DVD. But the Robert Van Gulik novel is still available.
The novel is not long--about 150 pages or so, so not too intimidating, if your are not familiar with this author. It opens dramatically: Judge Dee is travelling in his carriage with his three wives, and servants, when the carriage gets stuck, in a terrible storm. They are in a mountainous area, a long way from habitation. However, up the hill a ways, is a Taoist monastery. So the judge, his wives and companions, spend the night there.
The plot is constructed well. At first, it is not clear (either to Judge Dee, or to the reader) if any crime has been committed. Then more information is discovered, just incomplete glimpses of the whole picture. Towards the end, a couple of revelations reveals the truth.
So, a mystery in the classic style, with an unusual (and for me, very interesting) setting. The character drawing is sharp, too.
The author seems to have written his Judge Dee novels for fun. By day, he was a Dutch diplomat, who worked variously, in India, China (where he married a chinese woman), and Japan.
I am now going through the whole series, in the order of the time when they are set. So next, "The Chinese Gold Murders", which is set at the beginning of the Judge's career; then "The Lacquer Screen", and so on. (See Wikipedia for the comlete list, in order).
I found "The Haunted Monastery" a good introduction to Judge Dee.