Although this is YA, the only difference I noticed between it and his adult fiction was a bit more explanation of the way the MC is thinking. Not my favourite Pratchett, but I enjoyed it more than some of his early work.
I'm not counting them individually because I've read them all before, but it might be interesting to see how many of them I go through, and how often. I tend to read them in the bath, or if I can't sleep.
Why Didn't They Ask Evans? One of my favourites. The Labours of Hercules. Twelve Poirot short stories. The ABC Murders. I don't like this one so much, because I find Hastings so much less endearing than Watson. Death in the Clouds. I won't be reading this again - all the pages have fallen out! They Do It With Mirrors. Miss Marple in the country house of a childhood friend. The Murder of Rodger Acroyd The first time she used this gimmick. Murder is Easy Pulled this one randomly off the shelf in the dark, can't remember when I last read it.
Second in a series by Michelle West. Just as in the first in the series, I wasn't initially impressed with this book. About a quarter of the way through, the pace picks up and the story becomes much more interesting.