I was under the assumption that this is a book for young adults, but it's really bloodthirsty! You can't even get through the first chapter without someone being mauled to death by a prehistoric creature. There's a lot going on, from a pandemic to trophy hunting, genetic engineering and prehistoric beasts being cloned and brought back to life, but it's really well-written and action packed. I was disappointed to finish the book and find out that there's a sequel coming next year, as the ends weren't tied up at all in this one. It's like a big game of cat and mouse, with plenty of people meeting sticky ends. The characters are well-rounded and likeable (apart from the bad guys!) and you're really willing them to survive. It's clever to compare the video game they've been playing to the real life situation they end up in. Sadly, it looks like we'll have to wait another year to find out if they manage to stay alive...