In The Dead Letter, Henry Moreland is killed by a single stab to the back. Against a background of post-Civil War politics, Richard Redfield, a young attorney, helps Burton, a legendary New York City detective, unravel the crime. In The Figure Eight, Joe Meredith undertakes a series of adventures and assumes a number of disguises to solve the mystery of the murder of his uncle and regain the lost fortune of his angelic cousin.