The Practice Effect (Bantam Spectra Book)

Physicist Dennis Nuel is the first human to probe the strange realms called anomaly worlds: alternate universes where the laws of science are unpredictably changed. But the world Dennis discovers seems almost like our own―with one perplexing difference. To his astonishment, he’s hailed as a wizard, meets a beautiful woman with strange powers, and finds himself fighting a mysterious warlord as he struggles to solve the riddle of this baffling world.