"The Sea Fairies" by L. Frank Baum is a children's fantasy novel published in 1911. Young Trot and her loyal companion Cap'n Bill are transformed into mermaids and venture into an enchanting underwater world. There they encounter benevolent sea fairies, witness amazing sights in Queen Aquarine's kingdom, and face the villainous Zog the Magician and his sea devils. Originally intended to launch a new series, the story would eventually bring its heroes into Baum's beloved Oz universe. (This is an automatically generated summary.)