Forever — J. Channing

Gripping the box lid, he lifted it from the base and set it aside on the floor at his feet. Underneath, he found a machine that looked like a typewriter with two sets of keys, a row of lamps above the levers, and a set of dials at the top right. "It can't be," he whispered. What was supposed to be a relaxing expedition for cryptologist Yanis Miller turned into an adventure that he'd never imagined. Upon the discovery of an enigmatic box from Nazi Germany, he is faced with an adventure that could change both the past and future forever. And there's no turning back.