“But she did have his baby.”

“But not until a year after they were married. Tom Riddle left her while she was still pregnant.”

“What went wrong?” asked Harry. “Why did the love potion stop working?”

“Again, this is guesswork,” said Dumbledore, “but I believe that Merope, who was deeply in love with her husband, could not bear to continue enslaving him by magical means. I believe that she made the choice to stop giving him the potion. Perhaps, besotted as she was, she had convinced herself that he would by now have fallen in love with her in return. Perhaps she thought he would stay for the baby’s sake. If so, she was wrong on both counts. He left her, never saw her again, and never troubled to discover what became of his son.”

The sky outside was inky black and the lamps in Dumbledore’s office seemed to glow more brightly than before.

“I think that will do for tonight, Harry,” said Dumbledore after a moment or two.

“Yes, sir,” said Harry.

He got to his feet, but did not leave.

“Sir… is it important to know all this about Voldemort’s past?”

“Very important, I think,” said Dumbledore.

“And it… it’s got something to do with the prophecy?”

“It has everything to do with the prophecy.”

“Right,” said Harry, a little confused, but reassured all the same.

He turned to go, then another question occurred to him, and he turned back again. “Sir, am I allowed to tell Ron and Hermione everything you’ve told me?”

Dumbledore considered him for a moment, then said, “Yes, I think Mr. Weasley and Miss Granger have proved themselves trustworthy. But Harry, I am going to ask you to ask them not to repeat any of this to anybody else. It would not be a good idea if word got around how much I know, or suspect, about Lord Voldemort’s secrets.”

“No, sir, I’ll make sure it’s just Ron and Hermione. Good night.”

He turned away again, and was almost at the door when he saw it. Sitting on one of the little spindle-legged tables that supported so many frail-looking silver instruments, was an ugly gold ring set with a large, cracked, black stone.

“Sir,” said Harry, staring at it. “That ring—”

“Yes?” said Dumbledore.

“You were wearing it when we visited Professor Slughorn that night.”

“So I was,” Dumbledore agreed.

“But isn’t it… sir, isn’t it the same ring Marvolo Gaunt showed Ogden?”

Dumbledore bowed his head. “The very same.”

“But how come — ? Have you always had it?”

“No, I acquired it very recently,” said Dumbledore. “A few days before I came to fetch you from your aunt and uncle’s, in fact.”

“That would be around the time you injured your hand, then, sir?”

“Around that time, yes, Harry.”

Harry hesitated. Dumbledore was smiling.

“Sir, how exactly — ?”

“Too late, Harry! You shall hear the story another time. Good night.”

“Good night, sir.”