Sniff wants to be rich and important. But when he steals a gemstone from a huge lizard, Moomintroll convinces him to do the bravest thing of all - give it back.
There's been a robbery and its up to Moominvalley's newest Police Inspector, Stinky, to catch the culprit. But Moomintroll thinks he is actually the thief.
Fed up with the Groke, Little My and Snorkmaiden head to the Lonely Mountains to confront her. Meanwhile, a winged 'monster' is spotted in Moominvalley.
A bright star appears in the skies above Moominvalley or could it be a dangerous comet? Together, the valley must confront their fears to save the day.
