The incredibly long list of bibliographic references clearly shows the huge work done by Alina Chan and Matt Ridley, who tried to condense in this book everything we know on the origins of SARS-CoV-2. Although the authors favour one theory over the other (i.e. the lab leak hypothesis), all evidence pointing to both scenarios is carefully laid out, and it's the reader who decides. Having followed myself most of the stories told in the book, I can imagine how difficult it was to collect them and put them all together in a coherent and engaging text. The final result was very good!