Joe Haldeman

Private William Mandella is a reluctant hero in an interstellar war against an unknowable and unconquerable alien enemy. But his greatest test will be when he returns home. Relativity means that for every few months' tour of duty centuries have passed on Earth, isolating the combatants ever more from the world for whose future they are fighting.

From the winner of the 2006 Nebula Award for Best Novel comes this provocative story of a man who stumbles upon the discovery of a lifetime. After a laboratory calibrator turns into a time machine, lab assistant Matt Fuller has nothing to lose by taking the trip himself — or so he thinks.