S01E09 — Christmas Day

Thanks to his radio transmitter, Norbert informs his contacts that the mission will take place tonight. At the chalet, Christmas Eve is sad and silent: Guillaume is held up in the village due to an emergency, and César is still in the mountains. At the customs post, the customs officers learn that a secret document has been stolen from the National Research Center and that a gang is trying to smuggle it across the border. During the night, while everyone is asleep, Norbert places the microfilmed document inside Belle's collar, a gift for Sebastian. Belle immediately wears her new collar for the first time and sets off into the mountains. Sebastian's cries and protests are in vain, and without a word, he too runs off into the mountains in search of Belle. At the Grand Baou refuge, accomplices are waiting for the dog. Their mission is to take the contents of the collar and cross the border through a cave with a secret entrance built into the refuge's chimney.