I enjoyed the topic and the author's writing style. While being a bit slow at the start the pace got faster about halfway through the book. It's an interesting topic and I really like the descriptions of the de-extincted animals and the place in general, I could easily envision it in my mind. I would have loved to see more of the mentioned animals though, and for a thriller, in my opinion, the pace was a bit too slow, especially at the beginning, but it was overall OK. 

The story itself, well, I can just see how this could easily happen someday in the near future. As the main character says at the end "If something can be done, it will be done" ... And many things can go wrong when mankind tries to play God (just think Jurassic Park with creatures from a different period of Earth's history).

While not being the most intense thriller I've ever read, I sure enjoyed reading it and would recommend it to anybody who likes this topic, too, and doesn't mind a somewhat more relaxed pace.