In the late 1940s, Connecticut teenager Philippa "Flip" Hunter is sent to boarding school in Switzerland after recovering from a knee injury sustained in an automobile accident that also killed her mother. Her father Philip Hunter, an illustrator of children's books, is planning to travel around Europe making sketches for a book on lost children, and he is also being romantically pursued by the beautiful Eunice Jackman, whom Flip dislikes. At the boarding school, Flip resorts to going for illicit walks off the school grounds and discovers that Paul lives nearby with his father, and the two make friends and begin to meet regularly. She learns that Paul is a war orphan who was rescued by Madame Perceval's brother-in-law and that he has lost his memory of his past due to trauma he suffered in a concentration camp. Will Flip and Paul learn to overcome their respective pasts? Will the two lost souls end up falling in love? Read on!