Concerning Christie, Lassner notes that this was far from her first spy novel. Early in her career, Christie wrote a series of spy thrillers, such as "The Secret Adversary" (1922), "The Man in the Brown Suit" (1924), "The Big Four" (1927), and "The Seven Dials Mystery" (1929). However, "Passenger to Frankfurt" differs from other Christie novels, because it is not another example of detective fiction or crime fiction. It is a combination of thriller and dystopian fiction, exploring a hypothetical future for the entire world. The novel depicts a resurgence of Nazism, which depends on uniting the young people of the world under its creed. The new Nazi movement and its agents seduce the world's youth with promises of glory and heroism. The indoctrinated youth are manipulated into working to overthrow the governments of their respective nations and redeploying the national resources into supporting a new regime. The actual goal of the conspiracy is to establish a global oligarchy, controlled by a self-appointed master race.