The book Split Infinity is the first book in the series of Apprentice Adept by Piers Anthony. The book is a about an extremely short serf named Stile. A serf is what the basic person is called on the planet Proton. Proton is located in the same system as Earth. On Proton, there are two types of people, the serf and the citizen. Serfs are hired by citizens to do various thing around the planet, but serfs have limited tenure and when it runs out they are deported to Earth. Citizens are extremely wealthy people that hire serfs and have unlimited tenure. Stile is a normal serf that is very talented at the game, a game that tests all attributes of a human against others. Stile led a normal life until a mysterious robot is sent to protect him and attempts start being made on his life. Once, as he is trying to escape from pursuers, he accidentally crosses a curtain that teleports him to a mysterious world were magic really exists. He then has the ability to cross the curtain from world to world, but attempts at his life are made in the other world to. Stile must now try to find who is trying to kill him on both worlds and why. I would give this book four out of five stars because it keeps you interested and makes you want to read the whole series.