Paris adrift - E. J. Swift

Hallie moves to Paris to reinvent herself, find a new life, and maybe a new love.

She's off to a fair start, she's landed a bartending job at a dive called Millie's and found new friends in the eccentric crew that runs the place. Then, it gets weird. There's a strange woman who won't leave her alone. Garbled warnings from bizarre creatures disrupt her sleep. She keeps running into a man with a charming smile--a man she should probably steer clear of. And she can't stop falling back in time in Millie's keg room.

Soon, Hallie is caught up in something much bigger than herself-a project that this mystery man needs her to join. But with every trip through time, Hallie loses a little of herself, and each infinitesimal change she makes ripples through Paris, until the future she's trying to save suddenly looks nothing like what she hoped for