Carton had, in fact, formed a desperate plan to rescue Lucie's husband, whom he so much resembled in face and figure, even though it meant his own death. He went to Mr. Lorry and made him promise to have ready next morning passports and a coach and swift horses to leave Paris for England with Doctor Manette, Lucie and himself, telling him that if they delayed longer, Lucie's life and her father's also would be lost.
Next, Carton bought a quantity of a drug whose fumes would render a man insensible, and with this in his pocket early next morning he went to the spy, Barsad, and bade him redeem his promise and take him to the cell where Darnay waited for the signal of death.
Darnay was seated, writing a last letter to Lucie, when Carton entered. Pretending that he wished him to write something that he dictated, Carton stood over him and held the phial of the drug to his face. In a moment the other was unconscious. Then Carton changed clothes with him and called in the spy, directing him to take the unconscious man, who now seemed to be Sydney Carton instead of Charles Darnay, to Mr. Lorry's house. He himself was to take the prisoner's place and suffer the penalty.
The plan worked well. Darnay, who would not have allowed this sacrifice if he had known, was carried safely and without discovery, past the guards. Mr. Lorry, guessing what had happened when he saw the unconscious figure, took coach at once with him, Doctor Manette and Lucie, and started for England that very hour. Miss Pross was left to follow them in another carriage.
While Miss Pross sat waiting in the empty house, who should come in but the terrible Madame Defarge! The latter had made up her mind, as Carton had suspected, to denounce Lucie also. It was against the law to mourn for any one who had been condemned as an enemy to France, and the woman was sure, of course, that Lucie would be mourning for her husband, who was to die within the hour. So she stopped on her way to the execution to see Lucie and thus have evidence against her.
When Madame Defarge entered, Miss Pross read the hatred and evil purpose in her face. The grim old nurse knew if it were known that Lucie had gone, the coach would be pursued and brought back. So she planted herself in front of the door of Lucie's room, and would not let Madame Defarge open it.
The savage Frenchwoman tried to tear her away, but Miss Pross seized her around the waist, and held her back. The other drew a loaded pistol from her breast to shoot her, but in the struggle it went off and killed Madame Defarge herself.
Then Miss Pross, all of a tremble, locked the door, threw the key into the river, took a carriage and followed after the coach.
Not long after the unconscious Darnay, with Lucie and Doctor Manette, passed the gates of Paris, the jailer came to the cell where Sydney Carton sat and called him. It was the summons to die. And with his thoughts on Lucie, whom he had always hopelessly loved, and on her husband, whom he had thus saved to her, he went almost gladly.
A poor little seamstress rode in the death cart beside him. She was so small and weak that she feared to die, and Carton held her cold hand all the way and comforted her to the end. Cruel women of the people sat about the guillotine knitting and counting with their stitches, as each poor victim died. And when Carton's turn came, thinking he was Darnay, the hated Marquis de St. Evrémonde, they cursed him and laughed.