Leo Colston is a fictional character from the novel "The Go-Between," written by L.P. Hartley. Set in the early 1900s, the story follows Leo, a young boy who becomes an unwitting messenger between two lovers, leading to significant consequences. The novel explores themes of class, innocence, and the complexities of human relationships. The narrative is framed by Leo's adult reflections on his childhood experiences, highlighting how these events shaped his life. "The Go-Between" is often regarded as a classic of English literature and has been adapted into various forms, including film and stage productions.