Claire Conrad 
Soldier’s Destiny: Timewalkers: 2 (A Paranormal Time Travel Romance) [EPUB ebook] 

One hot summer night a freak lightning bolt strikes Sarah St. Pierre on Lake Michigan. She should have died that night. Unaware of her Timewalker heritage, Sarah is shocked when she is not only saved by a race of immortal aliens, but sent through time to save the city of Chicago from an alien attack.
Traveling through time has side effects, and Sarah struggles to control a frightening new ability no human should wield. She has three days to learn how to control her power and decide if she can trust Timothy Tucker, ex-military, spook and experimental weapons engineer, to help her.
Attraction is a complication she doesn’t need. And Tim is no knight in shining armor. He’s big, scarred and suspicious as hell…but sometimes you need someone who has walked in darkness to win the fight.