This been a bit of recent storm-in-a-teacup controversy about the author’s transphobia (which was very much exaggerated), precipitating a blacklisting of the author and the author’s books, and that the plot included a cross-dressing serial killer, which was actually a very minor part of the plot.
At 888 pages, it’s a rather long book, but I can’t think of much that could have been cut. Details that seemed irrelevant, actually turned out to be important.
It was the partners’ first cold case, the investigation of the disappearance and apparent murder of a general practitioner by a serial killer 40 years earlier.
Many possible suspects were introduced. I certainly wasn’t expecting the ending.