Third vote for Ender's Game
Quoted from SkyKing2301:Orson Scott Card - Ender's Game (and also Ender's Shadow)
A Salty Piece of Land by Jimmy Buffett
Flight of the Horse by Larry Niven
King David's Spaceship by Jerry Pournelle
Footfall by Niven and Pournelle
The Girl, the Gold Watch and Everything by John D MacDonald
The Book of Swords Series by Fred Saberhagen
The Dracula Series by Fred Saberhagen
The Odd Thomas Series by Dean Koontz
The Camel Club Series by David Baldacci
I could go on and on. I have over 600 novels by 104 different authors.