When Captain slips away, a fleeting glimpse of a mysterious tail leads her and Dad into a magical cave world filled with strange and wonderful creatures.

As curiosity pulls them deeper inside, Captain can’t stop wondering, what does that mysterious tail belong to? Will she and Dad discover its secret, or will the cave keep its magic hidden?

A prequel to the beloved A Big Blue Boat series, this playful rhyming picture book is written as a sing-along adventure that invites children to join in from the very first page.

Celebrates curiosity, family, and the joy of discovery.