Grandma convinces Polly and Mom to "unplug" for a day at the spa, but things go south quickly when Polly loses her mom's valuable phone and has to go on a tiny mission to retrieve it—all while evading Griselle's moves to steal the locket!

When Polly's locket goes on the fritz, she must dive into the history of Prudence Pocket to uncover the secret source of Pockite, which powers the locket's shrinking ability.