A Tale of Two Cities (1859) is the second historical novel by Charles Dickens. The plot centres on the years leading up to the French Revolution and culminates in the Jacobin Reign of Terror.
The book tells, first and foremost, the story of Charles Darnay and Sydney Carton, who look similar but are very different in their personalities. The term for this is a doppelganger. A doppelganger is a character that physically looks like another character but there are other differences, like beliefs, values, personalities, etc. Darnay is a romantic French aristocrat; Carton is a cynical English barrister. Both fall deeply in love with the same woman, Lucie Manette.