The heroine of the novel 'A Tale of Two Cities' is Lucie Manette, a five-letter name. She is the daughter of Dr. Manette, a French doctor who was unjustly imprisoned in the Bastille for 18 years. Lucie is a compassionate and loving character who helps to reunite her father with his long-lost family and eventually marries Charles Darnay, a French aristocrat. She is a symbol of hope and redemption in the novel, as she brings joy and happiness to those around her.