"Captain Salt in Oz" by Ruth Plumly Thompson is a fantasy novel written in the mid-20th century. The story follows the adventures of Captain Samuel Salt, the Royal Discoverer for Oz, as he sets sail on his ship, the "Crescent Moon", to explore new territories in the lands of Oz. Accompanied by King Ato, a rotund and cheerful character, and Roger, a gifted Read Bird, they embark on a voyage filled with potential discoveries, showcasing the whimsical and fantastical elements that characterize the Oz series. At the start of the tale, King Ato is eagerly awaiting the return of Captain Salt, who has been missing for nearly four years. They are soon reunited as Captain Salt arrives in the "Crescent Moon", prepared for an expedition. The opening chapters portray their planning and preparations for the voyage, revealing their camaraderie and the humorous dynamics between the characters. As they set sail, they encounter various fantastical creatures and locales, including an island inhabited by peculiar beings and a volcano, leading to a series of misadventures that blend excitement with lightheartedness, setting the stage for their explorations. (This is an automatically generated summary.)