Little Loulotte has certainly grown up. She now lives in Paris with her photographer husband Edmond, and their daughter Charlotte. Edmond’s work has taken him to the North Pole and Loulotte must leave for Venice to participate in a “sculptors of tomorrow” competition. She therefore asks her former nanny, Bécassine, if she’ll come and look after Charlotte. In Bécassine’s company even a ride on the subway becomes an adventure, but it is just the beginning of a comic one filled with peril and extraordinary events that takes the pair to Marseille, Ibiza and then all the way to Lapland. Will they manage to unravel the mystery surround Edmond’s disappearance? Will they manage to escape from the clutches of Gari and Baldi, the two thugs employed by Gaspard, the so-called family friend? Will they be able to elude all the traps and at last find the buried Viking ship with its fabulous treasure?