When Moominpappa and Moomintroll's "story battle" gets out of hand, a monstrous fish comes to life and Moominhouse is overrun by a wild jungle. Can the storytellers work together to find a happy ending?

Moomintroll's mind starts to play tricks on him when he's left home alone over night for the first time. But his worst fears are realised with the appearance of an all-too-real, nightmarish creature - The Groke!

When Mrs Fillyjonk embarrasses the Moomins into getting a maid, the Moominhouse becomes much better organized, but at what cost? Moominmamma must decide what matters more - what others think, or staying true to yourself.