Harry did not look at the twins. His face felt hot; he deliberately dropped his fork and dived down to retrieve it. He heard Fred say overhead, 'Ask us no questions and we'll tell you no lies, Hermione. C'mon, George, if we get there early we might be able to sell a few Extendable Ears before Herbology.'

Harry emerged from under the table to see Fred and George walking away, each carrying a stack of toast.

'What did that mean?' said Hermione, looking from Harry to Ron. ' "Ask us no questions . . ." Does that mean they've already got some gold to start a joke shop?'

'You know, I've been wondering about that,' said Ron, his brow furrowed. 'They bought me a new set of dress robes this summer and I couldn't understand where they got the Galleons . . .'

Harry decided it was time to steer the conversation out of these dangerous waters.

'D'you reckon it's true this year's going to be really tough? Because of the exams?'

'Oh, yeah,' said Ron. 'Bound to be, isn't it? OWLs are really important, affect the jobs you can apply for and everything. We get career advice, too, later this year, Bill told me. So you can choose what NEWTs you want to do next year.'

'D'you know what you want to do after Hogwarts?' Harry asked the other two, as they left the Great Hall shortly afterwards and set off towards their History of Magic classroom.

'Not really,' said Ron slowly. 'Except . . . well . . .'

He looked slightly sheepish.

'What?' Harry urged him.

'Well, it'd be cool to be an Auror,' said Ron in an off-hand voice.

'Yeah, it would,' said Harry fervently.

'But they're, like, the elite,' said Ron. 'You've got to be really good. What about you, Hermione?'

'I don't know,' she said. 'I think I'd like to do something really worthwhile.'

'An Auror's worthwhile!' said Harry.

'Yes, it is, but it's not the only worthwhile thing,' said Hermione thoughtfully, 'I mean, if I could take SPEW further . . .'

Harry and Ron carefully avoided looking at each other.

History of Magic was by common consent the most boring subject ever devised by wizardkind. Professor Binns, their ghost teacher, had a wheezy, droning voice that was almost guaranteed to cause severe drowsiness within ten minutes, five in warm weather. He never varied the form of their lessons, but lectured them without pausing while they took notes, or rather, gazed sleepily into space. Harry and Ron had so far managed to scrape passes in this subject only by copying Hermione's notes before exams; she alone seemed able to resist the soporific power of Binns's voice.

Today, they suffered an hour and a half's droning on the subject of giant wars. Harry heard just enough within the first ten minutes to appreciate dimly that in another teacher's hands this subject might have been mildly interesting, but then his brain disengaged, and he spent the remaining hour and twenty minutes playing hangman on a corner of his parchment with Ron, while Hermione shot them filthy looks out of the corner of her eye.

'How would it be,' she asked them coldly, as they left the classroom for break (Binns drifting away through the blackboard), 'if I refused to lend you my notes this year?'

'We'd fail our OWL, said Ron. 'If you want that on your conscience, Hermione . . .'

'Well, you'd deserve it,' she snapped. 'You don't even try to listen to him, do you?'

'We do try,' said Ron. 'We just haven't got your brains or your memory or your concentration — you're just cleverer than we are — is it nice to rub it in?'

'Oh, don't give me that rubbish,' said Hermione, but she looked slightly mollified as she led the way out into the damp courtyard.

A fine misty drizzle was falling, so that the people standing in huddles around the edges of the yard looked blurred at the edges. Harry, Ron and Hermione chose a secluded corner under a heavily dripping balcony, turning up the collars of their robes against the chilly September air and talking about what Snape was likely to set them in the first lesson of the year. They had got as far as agreeing that it was likely to be something extremely difficult, just to catch them off guard after a two-month holiday, when someone walked around the corner towards them.

'Hello, Harry!'

It was Cho Chang and, what was more, she was on her own again. This was most unusual: Cho was almost always surrounded by a gang of giggling girls; Harry remembered the agony of trying to get her by herself to ask her to the Yule Ball.

'Hi,' said Harry, feeling his face grow hot. At least you 're not covered in Stinksap this time, he told himself. Cho seemed to be thinking along the same lines.

'You got that stuff off, then?'

'Yeah,' said Harry, trying to grin as though the memory of their last meeting was funny as opposed to mortifying. 'So, did you . . . er . . . have a good summer?'

The moment he had said this he wished he hadn't — Cedric had been Cho's boyfriend and the memory of his death must have affected her holiday almost as badly as it had affected Harry's. Something seemed to tauten in her face, but she said, 'Oh, it was all right, you know . . .'

'Is that a Tornados badge?' Ron demanded suddenly, pointing to the front of Cho's robes, where a sky-blue badge emblazoned with a double gold 'T' was pinned. 'You don't support them, do you?'

'Yeah, I do,' said Cho.

'Have you always supported them, or just since they started winning the league?' said Ron, in what Harry considered an unnecessarily accusatory tone of voice.

'I've supported them since I was six,' said Cho coolly. 'Anyway . . . see you, Harry.'

She walked away. Hermione waited until Cho was halfway across the courtyard before rounding on Ron.

'You are so tactless!'

'What? I only asked her if — '

'Couldn't you tell she wanted to talk to Harry on her own?'

'So? She could've done, I wasn't stopping — '

'Why on earth were you attacking her about her Quidditch team?'

'Attacking? I wasn't attacking her, I was only — '

'Who cares if she supports the Tornados?'

'Oh, come on, half the people you see wearing those badges only bought them last season — '

'But what does it matter?'

'It means they're not real fans, they're just jumping on the bandwagon — '

'That's the bell,' said Harry dully, because Ron and Hermione were bickering too loudly to hear it. They did not stop arguing all the way down to Snapes dungeon, which gave Harry plenty of time to reflect that between Neville and Ron he would be lucky ever to have two minutes of conversation with Cho that he could look back on without wanting to leave the country.

And yet, he thought, as they joined the queue lining up outside Snape's classroom door, she had chosen to come and talk to him, hadn't she? She had been Cedric's girlfriend; she could easily have hated Harry for coming out of the Triwizard maze alive when Cedric had died, yet she was talking to him in a perfectly friendly way, not as though she thought him mad, or a liar, or in some horrible way responsible for Cedric's death . . . yes, she had definitely chosen to come and talk to him, and that made the second time in two days . . . and at this thought, Harry's spirits rose. Even the ominous sound of Snape's dungeon door creaking open did not puncture the small, hopeful bubble that seemed to have swelled in his chest. He filed into the classroom behind Ron and Hermione and followed them to their usual table at the back, where he sat down between Ron and Hermione and ignored the huffy, irritable noises now issuing from both of them.

'Settle down,' said Snape coldly, shutting the door behind him.

There was no real need for the call to order; the moment the class had heard the door close, quiet had fallen and all fidgeting stopped. Snape's mere presence was usually enough to ensure a class's silence.

'Before we begin today's lesson,' said Snape, sweeping over to his desk and staring around at them all, 'I think it appropriate to remind you that next June you will be sitting an important examination, during which you will prove how much you have learned about the composition and use of magical potions. Moronic though some of this class undoubtedly are, I expect you to scrape an "Acceptable" in your OWL, or suffer my . . . displeasure.'

His gaze lingered this time on Neville, who gulped.

'After this year, of course, many of you will cease studying with me,' Snape went on. 'I take only the very best into my NEWT Potions class, which means that some of us will certainly be saying goodbye.'

His eyes rested on Harry and his lip curled. Harry glared back, feeling a grim pleasure at the idea that he would be able to give up Potions after fifth year.

'But we have another year to go before that happy moment of farewell,' said Snape softly, 'so, whether or not you are intending to attempt NEWT, I advise all of you to concentrate your efforts upon maintaining the high pass level I have come to expect from my OWL students.

'Today we will be mixing a potion that often comes up at Ordinary Wizarding Level: the Draught of Peace, a potion to calm anxiety and soothe agitation. Be warned: if you are too heavy-handed with the ingredients you will put the drinker into a heavy and sometimes irreversible sleep, so you will need to pay close attention to what you are doing.' On Harry's left, Hermione sat up a little straighter, her expression one of utmost attention. The ingredients and method — ' Snape flicked his wand ' — are on the blackboard — (they appeared there) ' — you will find everything you need — ' he flicked his wand again ' — in the store cupboard — ' (the door of the said cupboard sprang open) ' — you have an hour and a half . . . start.'

Just as Harry, Ron and Hermione had predicted, Snape could hardly have set them a more difficult, fiddly potion. The ingredients had to be added to the cauldron in precisely the right order and quantities; the mixture had to be stirred exactly the right number of times, firstly in clockwise, then in anti-clockwise directions; the heat of the flames on which it was simmering had to be lowered to exactly the right level for a specific number of minutes before the final ingredient was added.

'A light silver vapour should now be rising from your potion,' called Snape, with ten minutes left to go.

Harry, who was sweating profusely, looked desperately around the dungeon. His own cauldron was issuing copious amounts of dark grey steam; Ron's was spitting green sparks. Seamus was feverishly prodding the flames at the base of his cauldron with the tip of his wand, as they seemed to be going out. The surface of Hermione's potion, however, was a shimmering mist of silver vapour, and as Snape swept by he looked down his hooked nose at it without comment, which meant he could find nothing to criticise.