A Union Soldier — Jeanyne Johnson

The town was called Mysteryville. Whoever thought up such a crazy name anyway? There were no mysteries in this town that she knew about. It had the normal schools, stores, gas stations, post office, library and houses. Nope, nada, nothing mysterious about this town, at least not to Ashley's thinking. Or was there? This first book in the series, A Union Soldier, thirteen year old Ashley finds out what is so special about Mysteryville. It changes not only her life but the life of Seth O'Hare who lived more than 100 years before her. She is transported back in time and realizes that his life depends on her quick thinking and her knowledge of the future.