Time’s Twisted Arrow: Book One of the CHRONOS Files by Rysa Walker
Kirkus Reviews ~ “Sharp writing, a flair for dialogue and a big, twisting imagination.” If not for the odd blue medallion around her neck, Kate would simply cease to be. And if she cannot learn to use that medallion to prevent her grandmother’s murder at the 1893 World’s Fair, billions of people will meet an identical fate at the hands of the Cyrists, a time-traveling cult planning a drastic form of environmental defense.
With so many lives at stake, Kate has no choice. But changing the timeline is not without cost. Kate will remember the past few months with the guy she loves, but when he looks at her, he’ll see a total stranger.