"The Toff on Board" is a mystery novel written by John Creasey, featuring the character The Toff, a gentleman detective known for his charm and intelligence. The story revolves around a murder that takes place on a train, where the Toff must use his wit and resourcefulness to solve the crime and uncover the truth. Set against the backdrop of the 1950s, the novel combines elements of suspense and intrigue, showcasing the Toff's ability to navigate social circles and gather clues. As he interacts with various passengers, he unravels secrets that lead to the resolution of the case, highlighting his skills as a sleuth.