Sebastian has grown (the boy is now 10 years old). He and Belle are waiting impatiently for Angelina to return. But she never reaches Saint Martin. There is terrible news: Angelina was lost when her plane crashed deep in the Transalpine forest. Sebastian's grandfather knows a man who could help them find Angelina. But before the boy and his dog can rescue the young woman, they must face a thousand dangers, endure a thousand ordeals and confront a secret.