Katie was removed to St. Mungo’s Hospital for Magical Maladies and Injuries the following day, by which time the news that she had been cursed had spread all over the school, though the details were confused and nobody other than Harry, Ron, Hermione, and Leanne seemed to know that Katie herself had not been the intended target.

“Oh, and Malfoy knows, of course,” said Harry to Ron and Hermione, who continued their new policy of feigning deafness whenever Harry mentioned his Malfoy-Is-a-Death-Eater theory.

Harry had wondered whether Dumbledore would return from wherever he had been in time for Monday night’s lesson, but having had no word to the contrary, he presented himself outside Dumbledore’s office at eight o’clock, knocked, and was told to enter. There sat Dumbledore looking unusually tired; his hand was as black and burned as ever, but he smiled when he gestured to Harry to sit down. The Pensieve was sitting on the desk again, casting silvery specks of light over the ceiling.

“You have had a busy time while I have been away,” Dumbledore said. “I believe you witnessed Katie’s accident.”

“Yes, sir. How is she?”

“Still very unwell, although she was relatively lucky. She appears to have brushed the necklace with the smallest possible amount of skin; there was a tiny hole in her glove. Had she put it on, had she even held it in her ungloved hand, she would have died, perhaps instantly. Luckily Professor Snape was able to do enough to prevent a rapid spread of the curse —”

“Why him?” asked Harry quickly. “Why not Madam Pomfrey?”

“Impertinent,” said a soft voice from one of the portraits on the wall, and Phineas Nigellus Black, Sirius’s great-great-grandfather, raised his head from his arms where he had appeared to be sleeping. “I would not have permitted a student to question the way Hogwarts operated in my day.”

“Yes, thank you, Phineas,” said Dumbledore quellingly. “Professor Snape knows much more about the Dark Arts than Madam Pomfrey, Harry. Anyway, the St. Mungo’s staff are sending me hourly reports, and I am hopeful that Katie will make a full recovery in time.”

“Where were you this weekend, sir?” Harry asked, disregarding a strong feeling that he might be pushing his luck, a feeling apparently shared by Phineas Nigellus, who hissed softly.

“I would rather not say just now,” said Dumbledore. “However, I shall tell you in due course.”

“You will?” said Harry, startled.

“Yes, I expect so,” said Dumbledore, withdrawing a fresh bottle of silver memories from inside his robes and uncorking it with a prod of his wand.

“Sir,” said Harry tentatively, “I met Mundungus in Hogsmeade.”

“Ah yes, I am already aware that Mundungus has been treating your inheritance with light-fingered contempt,” said Dumbledore, frowning a little. “He has gone to ground since you accosted him outside the Three Broomsticks; I rather think he dreads facing me. However, rest assured that he will not be making away with any more of Sirius’s old possessions.”

“That mangy old half-blood has been stealing Black heirlooms?” said Phineas Nigellus, incensed; and he stalked out of his frame, undoubtedly to visit his portrait in number twelve, Grimmauld Place.

“Professor,” said Harry, after a short pause, “did Professor McGonagall tell you what I told her after Katie got hurt? About Draco Malfoy?”

“She told me of your suspicions, yes,” said Dumbledore.

“And do you — ?”

“I shall take all appropriate measures to investigate anyone who might have had a hand in Katie’s accident,” said Dumbledore. “But what concerns me now, Harry, is our lesson.”

Harry felt slightly resentful at this: If their lessons were so very important, why had there been such a long gap between the first and second? However, he said no more about Draco Malfoy, but watched as Dumbledore poured the fresh memories into the Pensieve and began swirling the stone basin once more between his long-fingered hands.

“You will remember, I am sure, that we left the tale of Lord Voldemort’s beginnings at the point where the handsome Muggle, Tom Riddle, had abandoned his witch wife, Merope, and returned to his family home in Little Hangleton. Merope was left alone in London, expecting the baby who would one day become Lord Voldemort.”

“How do you know she was in London, sir?”

“Because of the evidence of one Caractacus Burke,” said Dumbledore, “who, by an odd coincidence, helped found the very shop whence came the necklace we have just been discussing.”

He swilled the contents of the Pensieve as Harry had seen him swill them before, much as a gold prospector sifts for gold. Up out of the swirling, silvery mass rose a little old man revolving slowly in the Pensieve, silver as a ghost but much more solid, with a thatch of hair that completely covered his eyes.

“Yes, we acquired it in curious circumstances. It was brought in by a young witch just before Christmas, oh, many years ago now. She said she needed the gold badly, well, that much was obvious. Covered in rags and pretty far along… Going to have a baby, see. She said the locket had been Slytherin’s. Well, we hear that sort of story all the time, ‘Oh, this was Merlin’s, this was, his favorite teapot,’ but when I looked at it, it had his mark all right, and a few simple spells were enough to tell me the truth. Of course, that made it near enough priceless. She didn’t seem to have any idea how much it was worth. Happy to get ten Galleons for it. Best bargain we ever made!”

Dumbledore gave the Pensieve an extra-vigorous shake and Caractacus Burke descended back into the swirling mass of memory from whence he had come.

“He only gave her ten Galleons?” said Harry indignantly.

“Caractacus Burke was not famed for his generosity,” said Dumbledore. “So we know that, near the end of her pregnancy, Merope was alone in London and in desperate need of gold, desperate enough to sell her one and only valuable possession, the locket that was one of Marvolo’s treasured family heirlooms.”

“But she could do magic!” said Harry impatiently. “She could have got food and everything for herself by magic, couldn’t she?”

“Ah,” said Dumbledore, “perhaps she could. But it is my belief—I am guessing again, but I am sure I am right — that when her husband abandoned her, Merope stopped using magic. I do not think that she wanted to be a witch any longer. Of course, it is also possible that her unrequited love and the attendant despair sapped her of her powers; that can happen. In any case, as you are about to see, Merope refused to raise her wand even to save her own life.”

“She wouldn’t even stay alive for her son?”

Dumbledore raised his eyebrows. “Could you possibly be feeling sorry for Lord Voldemort?”

“No,” said Harry quickly, “but she had a choice, didn’t she, not like my mother —”

“Your mother had a choice too,” said Dumbledore gently. “Yes, Merope Riddle chose death in spite of a son who needed her, but do not judge her too harshly, Harry. She was greatly weakened by long suffering and she never had your mother’s courage. And now, if you will stand…”

“Where are we going?” Harry asked, as Dumbledore joined him at the front of the desk.

“This time,” said Dumbledore, “we are going to enter my memory. I think you will find it both rich in detail and satisfyingly accurate. After you, Harry…”

Harry bent over the Pensieve; his face broke the cool surface of the memory and then he was falling through darkness again… Seconds later, his feet hit firm ground; he opened his eyes and found that he and Dumbledore were standing in a bustling, old-fashioned London street.

“There I am,” said Dumbledore brightly, pointing ahead of them to a tall figure crossing the road in front of a horse-drawn milk cart.

This younger Albus Dumbledore’s long hair and beard were auburn. Having reached their side of the street, he strode off along the pavement, drawing many curious glances due to the flamboyantly cut suit of plum velvet that he was wearing.

“Nice suit, sir,” said Harry, before he could stop himself, but Dumbledore merely chuckled as they followed his younger self a short distance, finally passing through a set of iron gates into a bare courtyard that fronted a rather grim, square building surrounded by high railings. He mounted the few steps leading to the front door and knocked once. After a moment or two, the door was opened by a scruffy girl wearing an apron.

“Good afternoon. I have an appointment with a Mrs. Cole, who, I believe, is the matron here?”

“Oh,” said the bewildered-looking girl, taking in Dumbledore’s eccentric appearance. “Um… just a mo‘… MRS. COLE!” she bellowed over her shoulder.

Harry heard a distant voice shouting something in response. The girl turned back to Dumbledore. “Come in, she’s on ‘er way.”

Dumbledore stepped into a hallway tiled in black and white; the whole place was shabby but spotlessly clean. Harry and the older Dumbledore followed. Before the front door had closed behind them, a skinny, harassed-looking woman came scurrying toward them. She had a sharp-featured face that appeared more anxious than unkind, and she was talking over her shoulder to another aproned helper as she walked toward Dumbledore.

“… and take the iodine upstairs to Martha, Billy Stubbs has been picking his scabs and Eric Whalley’s oozing all over his sheets — chicken pox on top of everything else,” she said to nobody in particular, and then her eyes fell upon Dumbledore and she stopped dead in her tracks, looking as astonished as if a giraffe had just crossed her threshold.

“Good afternoon,” said Dumbledore, holding out his hand. Mrs. Cole simply gaped.

“My name is Albus Dumbledore. I sent you a letter requesting an appointment and you very kindly invited me here today.”

Mrs. Cole blinked. Apparently deciding that Dumbledore was not a hallucination, she said feebly, “Oh yes. Well — well then — you’d better come into my room. Yes.”

She led Dumbledore into a small room that seemed part sitting room, part office. It was as shabby as the hallway and the furniture was old and mismatched. She invited Dumbledore to sit on a rickety chair and seated herself behind a cluttered desk, eyeing him nervously.

“I am here, as I told you in my letter, to discuss Tom Riddle and arrangements for his future,” said Dumbledore.

“Are you family?” asked Mrs. Cole.

“No, I am a teacher,” said Dumbledore. “I have come to offer Tom a place at my school.”