Keith Laumer 
World Shuffler [EPUB ebook] 

‘TWAS BORING IN ARTESIA…or so thought Sir Lafayette O’Leary, ex-craftsman from Earth, and now seemingly ex-interdimensional swashbuckler extraordinaire as well. His battles were all won, his dragons all slain and life was just the same boring round of riches, royal hunts and regatas. Boring, boring, boring; until he walked past the azalia…Suddenly Artesia was gone, and O’Leary was trapped in Melange, a world of giants and pirates, karate-chopping hags and electronic flying carpets, a world where goons and harlots are the spitting images (literally!) of his own aristocratic Artesian associates. And because they think he’s his double, lots of his new friends want O’Leary dead.Unless he can get through the interdimensional gate and find the continuum path back home, O’Leary’s life will never be boring again. Just short.