Chelsea is having trouble with her fifth grade history homework. Theodora, the magic cat, offers to take both Chelsea and her friend Robby back to the time of the Boston Tea Party. There they get to meet famous people such as John Hancock, Samuel Adams, and Benjamin Franklin. They meet regular people and find the customs strange. Then they run up against the British soldiers. Theodora helps them while they learn about the Boston Tea Party and have an adventure in old Boston.