BackTracker

Meet Harold Muldoon, the time-traveling detective. Twenty years ago, a monk with a kodachi cut off his head. Now his wife Irena is desperately trying to find him. So is Gavin Lennox, power-hungry owner of The Pearl, the hottest night spot in all of NewCity. Cyrus Horton, an eccentric inventor, has also joined in the search. But what they're really looking for is the BackTracker, a time travel device that has caused divergent realities to spiral out of control.  In one of them, Muldoon is still alive.  He was a private investigator, the best at what he did.
He solved his cases 100% of the time. Hindsight is, after all, 20/20. And the BackTracker allowed him to change the past. But in the process, his travels through time have unraveled the universe, stretching, tearing the fabric of space-time and sending his own mind into oblivion. He can no longer distinguish between true and false memories; he no longer knows who he was.  BackTracker is about a hero dealing with the consequences of his actions.
It's about second chances. And it's about what makes us human despite technology's power to shape society. But at its core, it's a story about a man and woman who won't allow anything to keep them apart-not space-time, not even death.