A young mermaid. A sea witch out for revenge. Can Brynn Finley become a sea guardian and help humans in danger when she just barely started the sixth grade?

Brynn Finley is the only mermaid in class who hasn't been able to learn mer-magic. Without it, she can't be a guardian of the sea with her parents and friends. On her quest to solve this mystery, Brynn encounters a loveable sea turtle, a pair of selkie sisters, and Phaedra, the great and terrible sea witch. Soon, Brynn is over her head in trouble, and she must learn to ask for help if she's going to follow the merfolk oath to be a protector of the ocean and a guardian of the sea.