Bellatrix still looked unhappy, though she appeared unsure how best to attack Snape next. Taking advantage of her silence, Snape turned to her sister.
“Now… you came to ask me for help, Narcissa?”
Narcissa looked up at him, her face eloquent with despair.
“Yes, Severus. I—I think you are the only one who can help me, I have nowhere else to turn. Lucius is in jail and…”
She closed her eyes and two large tears seeped from beneath her eyelids.
“The Dark Lord has forbidden me to speak of it,” Narcissa continued, her eyes still closed. “He wishes none to know of the plan. It is… very secret. But—”
“If he has forbidden it, you ought not to speak,” said Snape at once. “The Dark Lord’s word is law.”
Narcissa gasped as though he had doused her with cold water. Bellatrix looked satisfied for the first time since she had entered the house.
“There!” she said triumphantly to her sister. “Even Snape says so: You were told not to talk, so hold your silence!”
But Snape had gotten to his feet and strode to the small window, peered through the curtains at the deserted street, then closed them again with a jerk. He turned around to face Narcissa, frowning.
“It so happens that I know of the plan,” he said in a low voice. “I am one of the few the Dark Lord has told. Nevertheless, had I not been in on the secret, Narcissa, you would have been guilty of great treachery to the Dark Lord.”
“I thought you must know about it!” said Narcissa, breathing more freely. “He trusts you so, Severus…”
“You know about the plan?” said Bellatrix, her fleeting expression of satisfaction replaced by a look of outrage. “You know?”
“Certainly,” said Snape. “But what help do you require, Narcissa? If you are imagining I can persuade the Dark Lord to change his mind, I am afraid there is no hope, none at all.”
“Severus,” she whispered, tears sliding down her pale cheeks. “My son… my only son…”
“Draco should be proud,” said Bellatrix indifferently. “The Dark Lord is granting him a great honor. And I will say this for Draco: he isn’t shrinking away from his duty, he seems glad of a chance to prove himself, excited at the prospect—”
Narcissa began to cry in earnest, gazing beseechingly all the while at Snape.
“That’s because he is sixteen and has no idea what lies in store! Why, Severus? Why my son? It is too dangerous! This is vengeance lor Lucius’s mistake, I know it!”
Snape said nothing. He looked away from the sight of her tears as though they were indecent, but he could not pretend not to hear her.