Broken Rival by Tessa Bailey

Magnolia Brown loves Friday night football games, volunteering and dominating at high school swim meets. Just your average everyday eighteen-year-old. Except for one thing:

She’s from fifty years in the future.

Magnolia’s parents, two brilliant scientists, are the inventors of time travel, but due to widespread destruction and rampant abuse of the technology from a corrupt few, time travel is outlawed and punishable by death. When Magnolia’s parents are seized and executed for illegally traveling to the past, they leave Magnolia stranded in 2026 without a way to get home.

Now Magnolia has nowhere to turn but a complicated Kansas family with two sons—Fallon, her high school sweetheart with secrets of his own, and Ramsey, the brooding militia commander who hunts and kills criminals like her. Magnolia knows Ramsey resents and hates her, but how can he be her true enemy when he looks at her with such hunger, despite his callousness, and guards her with his very life? Which brother can she trust and is the real danger coming from inside the house?