Trixie Belden is a fictional character and the protagonist of a popular series of children's mystery novels created by Julie Campbell in the 1940s. The series follows Trixie, a young girl who lives in the fictional town of Sleepyside-on-Hudson, New York, as she embarks on various adventures with her friends, known as the Bob-Whites of the Glen. The books focus on themes of friendship, problem-solving, and adventure, appealing to young readers. Over the years, the series has expanded to include more than 30 titles, making Trixie a beloved character in children's literature.