A Sword in Time

Modern girl DaVinci doesn't recognize her life after a quick trip to the past turns her world upside down. Meanwhile Quintus, a swoony soldier from 53 BC stuck in this century, is set on time traveling to make good on a promise to Julius Caesar. When Quintus and DaVinci accidentally travel together to ancient Rome, the feisty pair are in danger of falling in love, if they don't kill each other first. One thing is clear: they've got to learn to get along if they want to make it back to the 21st century alive.

A Thief in Time and its sequels are exciting young adult romances packed with historical detail and plenty of action.