A 21st century woman shakes up a doctor's 19th century world. When the summit of Pikes Peak is beset with a summer storm, Lalita Torres thinks the embarrassment of trading her shorts and tank top for a touristy union suit to keep warm is the worst that could happen. She was wrong. A lightning strike sends her back a hundred and twenty-three years and into the care of Dr. Tate Cavanaugh. Lalita thinks she's in a reality TV show. Tate thinks she's lost her mind.

What if you had the power to change the past? It's 1907, and Nellie Hartford has a rare ability: a lightning strike can send her jumping through time. When the thunder rolls, the question is should she jump back to prevent the childhood fever that led to her husband's premature death or forward to find a treatment for her baby's severe gastrointestinal issues? And what if saving one leaves her without the other? What if she loses them both? Dr. Jeff Marshall doesn't quite know what to do with the woman who accosted him in the hospital parking lot looking like she walked off the stage of a melodrama. And he certainly never expected to be caught up in some kind of secret government time-travel experiments just by helping her. There's one thing he's sure of. He doesn't want her to leave.

Time agent Jewel Jamison promised a young Jack Cavanaugh that she'd be his 26th birthday present. She'd hoped for a fling with the man she'd become obsessed with in the history books, but Jack, having waited ten years for the sexy Jewel to show up in 1919, has plans to build a life together. Before they can even begin to explore the possibilities, however, Jewel realizes that the timeline is now missing something—namely World War I. A full-scale "time crisis" is raging as two factions battle through history—one trying to erase war and the other trying to erase time travel and all traces of it. Including traces like Jack Cavanaugh. As the "Time War" rages, Jewel has to choose: keep her promise to Jack and stay out of the war or break her promise in order to save him.