It seemed that Kreacher did not dare disobey a direct order; nevertheless, the look he gave Sirius as he shuffled out past him was full of deepest loathing and he muttered all the way out of the room.

' — comes back from Azkaban ordering Kreacher around, oh, my poor mistress, what would she say if she saw the house now, scum living in it, her treasures thrown out, she swore he was no son of hers and he's back, they say he's a murderer too — '

'Keep muttering and I will be a murderer!' said Sirius irritably as he slammed the door shut on the elf.

'Sirius, he's not right in the head,' Hermione pleaded, 'I don't think he realises we can hear him.'

'He's been alone too long,' said Sirius, 'taking mad orders from my mother's portrait and talking to himself, but he was always a foul little — '

'If you could just set him free,' said Hermione hopefully, 'maybe — '

'We can't set him free, he knows too much about the Order; said Sirius curtly. 'And anyway, the shock would kill him. You suggest to him that he leaves this house, see how he takes it.'

Sirius walked across the room to where the tapestry Kreacher had been trying to protect hung the length of the wall. Harry and the others followed.

The tapestry looked immensely old; it was laded and looked as though Doxys had gnawed it in places. Nevertheless, the golden thread with which it was embroidered still glinted brightly enough to show them a sprawling family tree dating back (as far as Harry could tell) to the Middle Ages. Large words at the very top of the tapestry read:

The Noble and Most Ancient House of Black

Toujours pur

'You're not on here!' said Harry, after scanning the bottom of the tree closely.

'I used to be there,' said Sirius, pointing at a small, round, charred hole in the tapestry, rather like a cigarette burn. 'My sweet old mother blasted me off after I ran away from home — Kreacher's quite fond of muttering the story under his breath.'

'You ran away from home?'

'When I was about sixteen,' said Sirius. 'I'd had enough.'

'Where did you go?' asked Harry, staring at him.

'Your dad's place,' said Sirius. 'Your grandparents were really good about it; they sort of adopted me as a second son. Yeah, I camped out at your dads in the school holidays, and when I was seventeen I got a place of my own. My Uncle Alphard had left me a decent bit of gold — he's been wiped off here, too, that's probably why — anyway, after that I looked after myself. I was always welcome at Mr and Mrs Potters for Sunday lunch, though.'

'But . . . why did you . . .?'

'Leave?' Sirius smiled bitterly and ran his fingers through his long, unkempt hair. 'Because I hated the whole lot of them: my parents, with their pure-blood mania, convinced that to be a Black made you practically royal . . . my idiot brother, soft enough to believe them . . . that's him.'

Sirius jabbed a finger at the very bottom of the tree, at the name 'Regulus Black'. A date of death (some fifteen years previously) followed the date of birth.

'He was younger than me,' said Sirius, 'and a much better son, as I was constantly reminded.'

'But he died,' said Harry.

'Yeah,' said Sirius. 'Stupid idiot . . . he joined the Death Eaters.'

'You're kidding!'

'Come on, Harry, haven't you seen enough of this house to tell what kind of wizards my family were?' said Sirius testily.

'Were — were your parents Death Eaters as well?'

'No, no, but believe me, they thought Voldemort had the right idea, they were all for the purification of the wizarding race, getting rid of Muggle-borns and having pure-bloods in charge. They weren't alone, either, there were quite a few people, before Voldemort showed his true colours, who thought he had the right idea about things . . . they got cold feet when they saw what he was prepared to do to get power, though. But I bet my parents thought Regulus was a right little hero for joining up at first.'

'Was he killed by an Auror?' Harry asked tentatively.

'Oh, no,' said Sirius. 'No, he was murdered by Voldemort. Or on Voldemort's orders, more likely; I doubt Regulus was ever important enough to be killed by Voldemort in person. From what I found out after he died, he got in so far, then panicked about what he was being asked to do and tried to back out. Well, you don't just hand in your resignation to Voldemort. It's a lifetime of service or death.'

'Lunch,' said Mrs Weasley's voice.

She was holding her wand high in front of her, balancing a huge tray loaded with sandwiches and cake on its tip. She was very red in the face and still looked angry. The others moved over to her, eager for some food, but Harry remained with Sirius, who had bent closer to the tapestry.

'I haven't looked at this for years. There's Phineas Nigellu; . . . my great-great-grandfather, see? . . . least popular Headmaster Hogwarts ever had . . . and Araminta Meliflua . . . cousin of my mother's . . . tried to force through a Ministry Bill to make Muggle-hunting legal . . . and dear Aunt Elladora . . . she started the family tradition of beheading house-elves when they got too old to carry tea trays . . . of course, any time the family produced someone halfway decent they were disowned. I see Tonks isn't on here. Maybe that's why Kreacher won't take orders from her — he's supposed to do whatever anyone in the family asks him — '

'You and Tonks are related?' Harry asked, surprised.

'Oh, yeah, her mother Andromeda was my favourite cousin, said Sirius, examining the tapestry closely. 'No, Andromeda's not on here either, look — '

He pointed to another small round burn mark between two names, Bellatrix and Narcissa.

'Andromeda's sisters are still here because they made lovely, respectable pure-blood marriages, but Andromeda married a Muggle-born, Ted Tonks, so — '

Sirius mimed blasting the tapestry with a wand and laughed sourly. Harry, however, did not laugh; he was too busy staring at the names to the right of Andromeda's burn mark. A double line of gold embroidery linked Narcissa Black with Lucius Malfoy and a single vertical gold line from their names led to the name Draco.

'You're related to the Malfoy's!'

'The pure-blood families are all interrelated, said Sirius. 'If you're only going to let your sons and daughters marry pure-bloods our choice is very limited; there are hardly any of us left. Molly and I are cousins by marriage and Arthur's something like my second cousin once removed. But there's no point looking for then on here — if ever a family was a bunch of blood traitors it's the Weasleys.'

But Harry was now looking at the name to the left of Andromeda's burn: Bellatrix Black, which was connected by a double line to Rodolphus Lestrange.

'Lestrange . . .' Harry said aloud. The name had stirred something in his memory; he knew it from somewhere, but for a moment he couldn't think where, though it gave him an odd, creeping sensation in the pit of his stomach.

'They're in Azkaban,' said Sirius shortly.

Harry looked at him curiously.

'Bellatrix and her husband Rodolphus came in with Barty Crouch junior,' said Sirius, in the same brusque voice. 'Rodolphus's brother Rabastan was with them, too.'

Then Harry remembered. He had seen Bellatrix Lestrange inside Dumbledore's Pensieve, the strange device in which thoughts and memories could be stored: a tall dark woman with heavy-lidded eyes, who had stood at her trial and proclaimed her continuing allegiance to Lord Voldemort, her pride that she had tried to find him after his downfall and her conviction that she would one day be rewarded for her loyalty.

'You never said she was your — '

'Does it matter if she's my cousin?' snapped Sirius. 'As far as I'm concerned, they're not my family. She 's certainly not my family. I haven't seen her since I was your age, unless you count a glimpse of her coming into Azkaban. D'you think I'm proud of having a relative like her?'

'Sorry,' said Harry quickly, 'I didn't mean — I was just surprised, that's all — '

'It doesn't matter, don't apologise,' Sirius mumbled. He turned away from the tapestry, his hands deep in his pockets. 'I don't like being back here,' he said, staring across the drawing room. 'I never thought I'd be stuck in this house again.'

Harry understood completely. He knew how he would feel, when he was grown up and thought he was free of the place for ever, to return and live at number four, Privet Drive.

'It's ideal for Headquarters, of course, Sirius said. 'My father put every security measure known to wizardkind on it when he lived here. It's unplottable, so Muggles could never come and call — as if they d ever have wanted to — and now Dumbledore's added his protection, you'd be hard put to find a safer house anywhere. Dumbledore is Secret Keeper for the Order, you know — nobody can find Headquarters unless he tells them personally where it is — that note Moody showed you last night, that was from Dumbledore . . .' Sirius gave a short, bark-like laugh. 'If my parents could see the use their house was being put to now . . . well, my mothers portrait should give you some idea.'

He scowled for a moment, then sighed.

'I wouldn't mind if I could just get out occasionally and do something useful. I've asked Dumbledore whether I can escort you, to your hearing — as Snuffles, obviously — so I can give you a bit of moral support, what d'you think?'

Harry felt as though his stomach had sunk through the dusty carpet. He had not thought about the hearing once since dinner the previous evening; in the excitement of being back with the people he liked best, and hearing everything that was going on, it had completely flown his mind. At Sirius's words, however, the crushing sense of dread returned to him. He stared at Hermione and the Weasleys, all tucking into their sandwiches, and thought how he would feel if they went back to Hogwarts without him.

'Don't worry,' Sirius said. Harry looked up and realised that Sirius had been watching him. 'I'm sure they'll clear you, there's definitely something in the International Statute of Secrecy about being allowed to use magic to save your own life.'

'But if they do expel me,' said Harry quietly, 'can I come back here and live with you?'

Sirius smiled sadly.

'We'll see.'

'I'd feel a lot better about the hearing if I knew I didn't have to go back to the Dursleys',' Harry pressed him.

'They must be bad if you prefer this place,' said Sirius gloomily.

'Hurry up, you two, or there won't be any food left,' Mrs Weasley called.

Sirius heaved another great sigh, cast a dark look at the tapestry, then he and Harry went to join the others.

Harry tried his best not to think about the hearing while he emptied the glass-fronted cabinets that afternoon. Fortunately for him, it was a job that required a lot of concentration, as many of the objects in there seemed very reluctant to leave their dusty shelves. Sirius sustained a bad bite from a silver snuffbox; within seconds his bitten hand had developed an unpleasant crusty covering like a tough brown glove.