Rollback

"In an alternative 1994, time travel is a commercial reality governed by a peculiar law of physics: Rollback-the universe's automatic reset against any attempt to alter the past. When "researcher" Paul Abercombe witnesses the brutal murder of a colleague in 1970, he becomes obsessed with a shadow known only as Norman. But as Paul digs deeper, the investigation takes a terrifying turn: the killer isn't just a ghost from history, but a predator hiding within Paul's own inner circle. With the truth finally uncovered and the body count rising, Paul's only hope lies in a desperate gamble. A potential loophole in the Rollback law offers one last chance to make things right-but will he truly find justice, or will he only make matters worse?"-- Provided by publisher.