Cliff Stoll, the mad scientist who invented the art of hunting hackers
Sometime in high school (middle maybe?), I had to pick a non-fiction book to read for school, and picked Cuckoo's Egg by Stoll. I was already in to computers, but had no idea what was possible or where that interest in computers would or could go, and this booked changed my view for the better. I distinctly remember my teacher questioning it was non-fiction when reading the jacket, but sure enough, it was. It's an great memory and amazing book, well worth reading still.