A boy named Joseph Lemon, who has a watch that allows him to time travel, comes across a girl named London Connors, who has a map that allows her to travel to anywhere on the map she points to. They discover that, together, they can travel to any time and any place. However, an evil being has come back from the past due to their paradox, and threatens to destroy time itself.
- Joseph Lemon, a boy who has a watch that allows him to go to any time
- London Connors, a girl who has a map that allows her to travel anywhere
- Young Vincent van Gogh, the child version of a famous artist, who painted paintings such as Starry Night
- Amelia Hummer, future 300th president of the United States and 46th female president of the United States