My rating: 4 of 5 stars
MIT lab technician Matt Fuller discovers that the calibrator he was working on can disappear. At first it vanishes for only a second, then for several seconds, then minutes. Matt decides it is, in fact, a sort of time machine, able to leap into the future for longer and longer periods of time each instance he activates it. He designs an experiment to send a turtle into the future, then finally himself.
When he reappears about a month later, Matt is accused of murder and arrested. To escape his circumstances, he leaps into the future once again. Stranger futures await him along with the growing desire to find a way to move backward in time to the beginning.
Joe Haldeman deftly weaves the elements of physics, religion, and technology together in this tautly imagined and plot-driven story. Despite the occasional high-level physics verbiage, the novel is a compelling read, completely unpredictable and un-put-down-able.