Sixteen-year-old Trinity Foxx does not believe her grandfather's latest treasure is a real dragon's egg until soldiers invade trying to steal it, a strange boy tells her she must work with him to stop an impending dragon war, and the dragon inside the egg begins telling her what to do.

Trinity, Connor, and Caleb are holed up in Texas when Emmy, the baby dragon, is caught on tape and the video goes viral, sending them on the road again, following an old map leading to a man who has come from the future to help.