 It was the introduction to a 1952 reprint edition of the novel which revealed that "Francis Stevens" was Bennett's pen-name.A year later she published her only science fiction novel, "The Heads of Cerberus" ("The Thrill Book", 1919).One of the first dystopian novels, the book features a "grey dust from a silver phial" which transports anyone who inhales it to a totalitarian Philadelphia of 2118 AD.