Dak's dad has been dead for seven days when suddenly he reappears.

He's the same in almost every way, with one startling exception: Dad has turned into a clownfish, and now lives in a tank at their local aquarium.

Dak is delighted by the news - he has Dad back, even if he isn't quite as he was before.

Deciding to keep Dad's transformation a secret, Dak visits him at the aquarium as often as he can, and ends up spending so much time there that they offer him a job.

This is how he comes to meet Violet, the owner's prickly but kindhearted niece; when the aquarium is threatened with closure, the pair must work together to save it.

For Dak, the stakes couldn't be higher - after all, if the aquarium shuts down, what will happen to the fish?