Sixteen-year-old Ruby Gillman is as awkward as she is adorable. She's desperately trying to find her place at Oceanside High School, where she feels totally transparent.
She's tutoring a young skater in math, with whom she's secretly in love, but who only seems to admire her ability to solve equations. And anyway, she can't hang out with the more interesting students at school, because her overprotective mother has strictly forbidden her to swim in the ocean. But the day she disobeys her and breaks this golden rule, she discovers that she is the direct descendant of the Kraken line of warrior queens, and that she is destined to ascend to the throne hitherto occupied by her grandmother: the warrior queen of the Seven Seas. The Kraken have sworn an oath to protect the world's oceans from the greed and vanity of the mermaids, their sworn enemies. The only real problem for Ruby is that she'll be up against Chelsea, the prettiest and most popular freshman in high school, who just happens to be a mermaid. Ruby will have to embrace her destiny and assert herself to protect those she loves the most.
