Dan describes the things he does with his grandfather who is also named Dan.

Together with Grampa, Ray Halfmoon, a Seminole-Cherokee boy, finds creative and amusing solutions to life's challenges.

Hoping to surprise his grandfather on Father's Day, Eric tries both a bird sculpture and a pickle pizza and worries about the acceptability of both gifts.

Bored and impatient because her mer-family only seems to summon her when they need her healing abilities, fourteen-year-old India Finch decides to ignore her grandfather and visit them without being called--but when she and her mermaid friends decide to entertain themselves by combining their powers the result is a disaster that exposes the existence of the merpeople to human eyes.

Morgan, a sea witch, has a deep hatred for the merpeople whom she blames for her lover, India Finch's father, leaving her--she hopes to use a hurricane to destroy them, and when fourteen-year-old India warns the mer, Morgan summons a giant squid to attack India, India's grandfather, and any of the mer who get in the way.