IF Angel Odell hadn't had a French nursery governess, and if that French governess hadn't suddenly recognized her lost lover in a wounded French sergeant on the sea-front, the Valois story would have been a Christmas tragedy instead of-what it turned out to be. This was strange, because neither the little American girl nor her governess nor her governess's lover had ever heard of the Valois family, nor had the Valois family heard of them. But most things that happen are strange, if seen from every point of view.