The Variant War by Les Abernathy

Life is difficult enough as it is without someone traveling back in time to kill you. Now imagine an entire army of people dedicating themselves to erasing your existence. Because you were born in another time, another history, forsaken by what was meant to be. Where no means are too horrific and no weapons are too inhumane to bring about your annihilation. Now imagine, that instead of hiding, you chose to fight back. This is the life of a Variant. Jonathan Snyder was the ideal example of a Variant who chose to resist others' interpretation of destiny. Disciplined, focused, uncompromising. Combined with his ruthless demeanor with a gun, he also made for an excellent assassin. That is until his past literally catches up with him, and he is forced to escape into the multiverse. Snyder must tear spacetime apart in order to find out who is hunting him before he is erased from time itself.