Mercury, Saturn, and Neptune don't know they are about to become the best of friends. It all begins in the town of Peteyville, where the three girls all apply for the same job at the post office-and all three girls are hired.
The girls are all given a chance to prove themselves, even though the postmaster only needs one person for the task. It is here where the girls realize they are connected in more ways than one, and thanks to the mayor, the girls find out they're related. Hmmm...they are all named after planets
Given the job as a team, the girls will go on to encounter...