Paradox

SOMETIMES A PARADOX IN TIME CAN BE A GOOD THING
Logan Walker needs to graduate from college in four years in order to gain his inheritance. The problem is that he's a video game playing slacker. His attempt to earn enough credit hours takes a nasty wrong turn, resulting in a discovery that may cause him to be expelled from school.
His life becomes even more complex and hazardous when he finds he's somehow accidentally traveled in time back to the Pleistocene. Once there, he discovers he must adapt to a fierce world that allows no replays.
His survival hinges on the goodwill of a mysterious Clovis culture girl with problems of her own. Together the two encounter enemy tribesmen, fierce animals, and war while stumbling into an unexpected relationship.
Will they survive attacks from warriors, and animals? Will Logan win out over his modern adversaries? Will the two defeat their most powerful enemy: Time itself?