Thirteen-year-old Nono has never known his mother. His father, inspector Feierberg, is the best police inspector in the whole world. Nono tries very hard to be like him, but he always gets into trouble. Therefore, his father sends him to uncle Sjmoel. But, on the train he meets the mysterious first-class criminal Felix Glick. Together they travel to the French Riviera in search of the truth about his mother.