The character 'Sydney Carton' is found in -

A Tale of Two Cities is a novel by Charles Dickens that was first published in 1859.
- The story is set in the late 18th century against the background of the French Revolution.
Some important characters from this novel -
- Charles Darnay,
- Sydney Carton,
- Doctor Manette,
- Lucie Manette,
- Monsieur Defarge etc.
Source: Britannica.com