The magical Summer Shadow suit has disappeared and it needs to be stopped once and for all. But the shadow chest has mysteriously disappeared from its hiding place and everyone needs to be on the lookout for the biggest prankster of them all.

Lykke and Isak have just read a rhyme to make the Summer Shadow appear. Imagine how much fun it would be if the number one mischiefer were to show up at Isak’s birthday party at the playground! At least that’s what Lykke and Isak believe, but then the party receives a visit from the magical suit. Lykke and Isak now need to stop the Summer Shadow before the suit causes too much trouble!