A coming of age story in the tradition of Marjane Satrapi's Persepolis, Tillie Walden's Spinning, and Mariko Tamaki's This One Summer. Antoine, a teenager, is on holiday at the seaside with his parents and his younger brother, Titi. Both spend most of their time drawing, at restaurants and on the beach. But one day Helene and her mother come to spend a few days with the family and her presence will change Antoine's life. In A Sister, Bastien Vives, a master storyteller, conveys the stumbling awakenings of adolescent feelings.