The Hardys purchase a Chinese junk to use as a ferry service, in order to make some money over the summer. It soon becomes apparent that others are very interested in the ship.

In 1421, the largest fleet the world had ever seen set sail from China under the command of Emperor Zhu Di's loyal eunuch admirals. But by the time they returned home, Zhu Di had lost control and China was turning inwards, leaving the records of their discoveries to be forgotten for centuries.

Frank and Joe set out to solve another exciting mystery.

The Hardys purchase a Chinese junk to use as a ferry service, in order to make some money over the summer. It soon becomes apparent that others are very interested in the ship.