A grumpy little fish and a cheerful little fish set off on an adventure together: who would ever have thought they’d become friends?

In a bustling underwater city, Grumpyfish feels out of place everywhere. He’d much rather stay safe in his old shipwreck on the edge of the reef. But his peace and quiet is severely disrupted when the hyperactive Pip unexpectedly turns up on his doorstep. And as if that weren’t enough, Pip and Moppervis both lose their homes! There’s only one chance to put everything right in time: they must find the legendary Glinster – a mysterious fish which, according to the stories, can grant one wish. Moppervis doesn’t believe a word of it, but Pip manages to win him over with her infectious enthusiasm. What begins as a quest across the ocean turns into an unforgettable adventure full of friendship and surprises. But they must hurry, because they aren’t the only ones looking for Glinster.