At the Senior Sunrise overnight, Natalia must work with ex-best friend Ethan to find seven of the class's confessional letters before any secrets, including their own, are revealed.

"Since Grandpa died, Dally's days are dull and restricted. She's eleven and a half years old, and her exacting single mother is already grooming her to take over the family business. Starved for adventure and release, Dally rescues a mysterious envelope from her mother's clutches, an envelope Grandpa had earmarked for her. The map she finds inside leads straight to an ancient vault, a library of secrets where each book is a portal to a precise moment...

"Learn letters with Big Bird. Join Big Bird and other beloved Sesame Street characters like CCookie Monster, Elmo and Grover for an ABC exploration. Tough the letters to hear their names and the sounds they make. Then sing along with the ABC song!" -- back of package.