On the northern edge of the Wolf Hills, where the spruce trees spread long shadows over the cool ground, a young pack was just gathering. Among them, Torkel, a wolf with thick, silvery fur and eyes that glittered in the light of the setting sun, was the loudest voice of his opinion. The pack had always been synonymous with safety and strength, but last night the silence of the forest was broken by an unfamiliar roar that pierced everything. That evening, as the cool mist began to drift over the ground, Torkel gathered the others: the feisty Ylvi, the quiet Freya and Rune, younger than himself, who was just learning the art of tracking. They stood on the edge of a cliff, overlooking the entire Wolf Hills - dark, endless and full of echoing mysterious sounds. - 'Did you hear that yesterday? - Ylvi asked, looking at the shadows under the trees. Freya nodded, and her ears moved restlessly. - 'Something big entered our territory,' she whispered. - It smelled alien. Not like any wolf, not like a fox. Torkel cast Freya a penetrating glance. - The pack cannot afford to be afraid. We must find out what it was. Tonight we will follow the trail. Ylvi raised her head, not hiding her excitement. Rune cmoched uncertainly, but finally nodded. Everything in the Wolf Hills had its rhythm and its rules. However, what had occurred last night had disrupted the order they had always known. So they moved deeper into the forest. Needles rustled under their paws, the air was full of pungent scents. The trail led through a rocky ravine, where echoes repeated their every step, until they reached a place even Torkel did not know - an old, abandoned clearing where only dead trees grew. In the middle of the clearing lay the remains of what must once have been a deer - but something else caught their attention. Imprinted in the soft earth was the mark of a paw, a huge one, completely unlike a wolf's. - 'Someone else is here,' whispered Rune, staring at the mark. - 'And I think he'll be back soon. At the same moment, a crackle of branches sounded from the thicket on the other side of the clearing. All the wolves froze, feeling the tension cut the fur on the back of their necks. A pair of bright yellow eyes emerged from the shadows - and a completely unfamiliar silhouette that none of them had ever seen before. The pack knew that here was their world changing forever....