I'm biased since I'm married to the author, but I highly recommend "Poached: Inside the Dark World of Wildlife Trafficking". Rachel (the author) does on the ground reporting in 12 countries interviewing poachers, traffickers, customers, conservationists, and government officials. Her description of meeting Sudan, the last male northern white rhino that died earlier this year, is haunting. There are also some other great scenes like her sneaking into a South African prison to meet a convicted trafficker. It's entertaining, informative and important:

https://www.amazon.com/Poached-Wildlife-Trafficking-Merloyd-...