From the publisher:
The Fourth of July is on its way, and Abby Hunter has big plans. As president of the Cul-de-sac Kids, she declares "Mailbox Mania" on Blossom Hill Lane. The kids decorate their mailboxes. And choose a judge to vote for the winner!

Before long, the friends are fighting and everyone is upset. Then a mysterious gift shows up in each of their mailboxes. Who hid the presents there? And why?