In the far north, in a small village on the shores of a cold sea, there lived a girl called Freja. Freja was a Viking - brave and curious about the world. Every day she played with her dog, the black and shaggy Loki. One morning, when the sun barely peeked out from behind the clouds, Freja and Loki ran to the beach to look for shells. Suddenly Loki started barking and scratching the sand. Freja came closer and saw that there was something wooden sticking out. They helped themselves with their hands and paws until, from under the sand, they extracted an old, heavy chest with an iron lock. On the lid was a map engraved with a mysterious X! Freja felt a thrill of excitement. She tried to open the chest, but the lock didn't budge. Suddenly they heard rustling from the nearby forest....