This is a short-answer space. I can make a general statement though. Lucie is Dr. Manette's kind, loving and beautiful daughter, she helped bring him back from the brink of insanity after his unjust imprisonment. Lucie evokes a deep love from those around her, including her father, Charles Darnay (who eventually marries her), Mr. Stryver, Miss Pross, and, perhaps most of all, Sydney Carton. She cares deeply for her father and marries Charles only after she reassures her father that the marriage will not separate her from him at all. Her beauty and tenderness evoke the last sentiments of real love and emotion in Sydney Carton, as Lucie is one of the last people on earth to treat him with sympathy and kindness. His deep, unspoken love for her leads him to commit an extremely selfless and courageous act on her behalf.