The Golden Trident

● "Mermaid Brynn's got a new math teacher, but he's not a merman—he's a dagon! As she struggles to give him a fair shake, Brynn must also discover the whereabouts of the Golden Trident, an ancient artifact Phaedra the sea witch needs for her plan to summon up a shadowy creature from the darkest depths of the sea. " ― quoted from this book's Amazon product page as of 2022-02-04.