Caught in a tussle with an adult grantuff, Seeley mermaid loses her memory. It has become stuck on a baby grantuff and the only way to get it back is to touch it.
The journey to the Marine Agriculture College to meet Uncle Nav and get Seeley's memory back starts quietly enough.
But it isn't long before the whole family thrown headlong into another adventure and they discover a world where slavery and cruelty are part of everyday life.