"Billie Bradley and Her Classmates; Or, The Secret of the Locked Tower" by Janet D. Wheeler is a novel likely written in the early 20th century. The story centers around Billie Bradley and her friends as they navigate their lives at Three Towers Hall, a boarding school, embarking on various adventures that mix fun with a sense of mystery and danger. At the start of the story, Billie, along with her classmates Violet and Laura, is excitedly skating on a lake that has frozen unusually early in the season. Their joy is abruptly interrupted when they hear cries for help and rush to the scene, discovering three small children stuck in icy water. The girls spring into action, displaying their bravery and resourcefulness as they rescue the frightened children. The opening sets a lively tone while introducing key characters and laying the groundwork for themes of friendship, adventure, and the challenges that lie ahead. (This is an automatically generated summary.)