Borrowed Time by Keith Hughes

Ness Relevant is living on borrowed time. Molecular implosion, cellular degeneration, and dangerous men are but a few of the perils faced by the friendly and unassuming forensic photographer.His quiet bachelorhood is interrupted when he receives an innocent looking device in the mail from a friend and former college professor. Ness unexpectedly finds himself embroiled in events driven by his friend's success.This device is the focal point of a struggle that could overturn the whole world should Ness or his friend's invention fall prey to greedy men. Before his time runs out Ness must travel back to an uncomfortable past to prevent an unthinkable future.