Hmmm...hard to know where to begin. The obvious would be: the late Michael Crichton; excellent author. Richard Preston: great author. But Crichton + Preston = not excellent or great. I was very disappointed with this novel. The story starts off well enough: Nanigen MicroTechnology is working on mini robots (better known as "bots") that will be able to go into the jungle and pick up biological materials from plants and insects for medicinal purposes. Seven students from Cambridge are lured there for possible positions, but then find themselves shrunk down to the size of a fingernail and dumped into the wild. They have to fend off bugs and other dire conditions. In my opinion, an adult version of Honey I Shrunk the Kids without the humor.
Try reading The Hot Zone by Richard Preston or any other Michael Crichton novel. A much better use of your time.