Behind the mountain, where the wind always sings and the sea hums like a huge shell, lived a little Viking named Leif. Leif had a red cap, a wooden sword and a faithful dog Burk, who always ran along with him. One morning, while Leif and Burek were playing on the beach, something bright flashed in the sand. Leif ran closer and saw an old roll of paper tied with string. He quickly unrolled the map. There were mountains, a forest and a big X drawn on it. Next to the X, someone had drawn a small boat and a mysterious key. "Is this a treasure?" - whispered Leif with delight. The burro barked happily. Leif was looking forward to the adventure. He jumped into his wooden boat and Burek jumped in after him. They sailed through the roaring waves, laughing and singing a song about Vikings. After a while, a strange, misty island that Leif had never seen before appeared on the horizon. As they came to shore, they saw a mysterious shadow flitting between the trees. The behemoth turned furry. Leif squeezed his sword tightly and....