When Rosie finds out it's her Abuela's birthday, she puts together a birthday party in a box and tries to mail it all the way to Mexico! But how will the package arrive? Will a wizard take it? Or maybe ... a mouse? Rosie and Gatita learn how the postal system operates and all the supertastical work that goes behind mailing a package. Happy birthday, Abuela!

This book is based on "Rosie's Rules" hit animated series airing on PBS Kids!