I bought Micro from the paperback rack before a flight. It was a Michael Crichton novel that was unfinished upon his death and finished by somebody who I can't remember.
A company figures out how to shrink people and machinery down to 1/2" tall so that they can better research plants, insects, and bacteria in the rainforest to develop new drugs and chemical weapons. Some researchers get released into a rain forest while shrunken in an attempt to eliminate them because they "know too much" where they have to fight a bunch of insects, mice, spiders, etc before they can escape. So basically it was Jurassic Park with giant insects.
Had some kinda gross out/chilling/body horror deaths (one guy get torn apart by ants, another gets mistaken for a caterpillar by a wasp who then lays her eggs in him which then burst forth "Alien" style, one of the bad guys gets liquified by a spider) which are made more interesting in the fact that they are really the way insects feed on other insects, but unless you are looking for something mindless you could read in a three hour flight I would skip it and reread Jurassic Park or Andromeda Strain.