JUXTAPOSITION ( SEQUEL TO BLUE ADEPT)
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!