I had been expecting this question. I knew exactly what I would say.
The late, great P. D. James takes us inside the mind of a murderer.
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You know Princess Isla Mancelli, of course.
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(@FaberBooks, 3 January 2019, e-book, 23 pages, bought from @AmazonKindle)
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I thought this was a great little story. I liked the fact the story is narrated in the first person by a murderer. PD James lets us see the killer's motives for the crime, his careful planning and execution and the aftermath which has some unexpected consequences. This is a dark story, but I also found it funny at times as the killer learns some hard truths.