Apprentice Adept (7 Book Series)

On the technological, decadent world of Proton, someone was trying to destroy Stile, serf and master Gamesman. His only escape lay in Phaze, a world totally ruled by magic. Soon he learned that his alternate self had already been murdered, and that he was next. On Proton, his fate depended on winning the great Games. On Phaze, he must master magic to survive. And if he used any magic at all, his friends were determined to kill him at once!

In Book Two of the epic adventure that began in SPLIT INFINITY, Stile discovers life on Proton and Phaze is getting more difficult. On Proton he's a serf trying to prove his right to exist by competing in the Great Games. And on Phaze, where only magic worked, he was the Blue Adept trying to master the powers of sorcery. On both worlds, someone was trying to assassinate him. And as if that weren't enough, he has to win the love of Lady Blue, fight a dragon, discover the ultimate weapon, and of course, seek out the all-powerful Citizen who was trying to kill him!

Stile had problems--two whole worlds of problems, in fact.
On Proton, a world of future science, his murder was averted only by the help of a lovely robot, who sent him through an invisible "curtain" to Phaze, an alternate world ruled by magic. There he found he was the double of the sorcerer, the Blue Adept, who had been mysteriously murdered. And the assassin was after Stile!