Puerto Rico's magical Carnival is full of sights and sounds to explore. Rosi CoquÍ is determined to show her brother the very best way to enjoy the parade, while Rafi has a plan to make his sister queen for a day! But when Rafi scares Rosi with his terrible vejigante mask, she decides it's time to teach him a lesson. Little sister has a few tricks up her sleeve–and it's all part of the mischief of Carnival!