What literary device does Dickens use to allow Darnay to be rescued from the guillotine?
The ruse used to smuggle Charles Darnay out of prison before his execution is foreshadowed early in the novel during the English trial of Darnay, who has been falsely accused of a crime. The physical resemblance between Sidney Carton and Darney is enough to allow one to pass for the other. Dopplegangers, or doubles, are used in many novels to point up the possibilities for variety in personality based on numerous factors outside of physical similarity. The rescue of Darnay illustrates the ultimate nature of both characters, while depending entirely on a superficial resemblance.