August 1914. While the German army is gaining ground in the North of France, four boys aged 10 to 15, LUcien, LUcas, LUigi and LUdwig are left behind during the evacuation of their orphanage. Without the protection of Abbé Turpin and the schoolteacher Leutellier, the Lulus are now stranded on their own behind the enemy front line. Soon joined by LUce, a pretty young girl separated from her parents, they decide to reach the neutral country of Switzerland by all means possible... they embark on an adventure for which nothing and no one has prepared them!

The Lulus

Marie-Luce Bison, 14 years old, is raised by her father in a cheerful boarding house for seniors where he is the director. It is soon the costume party of her new college: her father does not want her to go ... and anyway, she is not invited. But pushed by Albert, her 80-year-old best friend, Marie-Luce crashes the party, dressed as a man. That evening, everyone takes her for a boy... a boy who is looked at and who pleases. She then decides to invent a male double named Leo to finally live her teenage life. Of course, at home, the relationship with her father becomes complicated.