 In 1918 she published her first , and perhaps best , novel The Citadel of Fear ( Argosy , 1918 ) . This lost world story focuses on a forgotten Aztec city , which is " rediscovered " during World War I. It was in the introduction to a 1952 reprint edition of the novel which revealed for the first time that " Francis Stevens " was Bennett 's pen @-@ name . 
