A Murder in Time — Jonas Saul

The only way Marcus Johnson can get any serious cash is to steal it. Once the money is stashed in his car, he will call the police on himself. It was the only way he could pull it off. His was the perfect plan. But he can't stop what happens next. He stole from the wrong people, who murder Katy, his new girlfriend. He goes insane with despair and begs God for a chance to right his wrong, but He isn't listening. In a feeble attempt to escape, Marcus runs from Katy's murderers, slips through time and lands in the parking lot of the store - a night earlier, where he spots himself inside, preparing to commit the crime that started everything. He possesses a wondrous tool: the ability to travel through time. But a tool this powerful needs someone who knows how to wield it. The more he tries to fix his past mistakes, the closer he gets to a murder in time.