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As soon as Elf, a dog from a shelter, has found a new home, he gets lost. Alone in the great forest, far from his people and a cosy bed, he finds himself in even more trouble - evil people throw him into a cramped cage.

But Big and Young, the Elf's new owners, or rather his new family, do not sit idly by and get on the trail of their pet. They help the police in the investigation, Young meets a girl, and Big finds new friends from the anti-terrorist brigade.