Gabrielle Paradis, 10, enters grade 5 while her best friend, Noemie, has just moved to the "end of the world". In addition to this difficult start, many challenges await Gabrielle, including the start of her judo classes. The only girl in the group, she has to face boys. One of them moved in, with her twin brother and single mother, into Noemie's former home. His name is Thomas and Gabrielle is not insensitive to the small hollow that forms in his cheek when he smiles ...