At that precise moment the door of their compartment slid open.

At that precise moment the door of their compartment slid open.

‘Oh ... hello, Harry,’ said a nervous voice. ‘Um ... bad time?’

Harry wiped the lenses of his glasses with his Trevor-free hand. A very pretty girl with long, shiny black hair was standing in the doorway smiling at him: Cho Chang, the Seeker on the Ravenclaw Quidditch team.

‘Oh ... hi,’ said Harry blankly.

‘Um...’ said Cho. ‘Well ... just thought I'd say hello ... ‘bye then.’

Rather pink in the face, she closed the door and departed. Harry slumped back in his seat and groaned. He would have liked Cho to discover him sitting with a group of very cool people laughing their heads off at a joke he had just told; he would not have chosen to be sitting with Neville and Loony Lovegood, clutching a toad and dripping in Stinksap.

‘Never mind,’ said Ginny bracingly. ‘Look, we can easily get rid of all this.’ She pulled out her wand. ‘Scourgify!’

The Stinksap vanished.

‘Sorry.’ said Neville again, in a small voice.

Ron and Hermione did not turn up for nearly an hour, by which time the food trolley had already gone by. Harry, Ginny, and Neville had finished their pumpkin pasties and were busy swapping Chocolate Frog Cards when the compartment door slid open and they walked in, accompanied by Crookshanks and a shrilly hooting Pigwidgeon in his cage.

‘I'm starving,’ said Ron, stowing Pigwidgeon next to Hedwig, grabbing a Chocolate Frog from Harry and throwing himself into the seat next to him. He ripped open the wrapper, bit off the frog's head and leaned back with his eyes closed as though he had had a very exhausting morning.

‘Well, there are two fifth-year prefects from each house,’ said Hermione, looking thoroughly disgruntled as she took her seat. ‘Boy and girl from each.’

‘And guess who's a Slytherin prefect?’ said Ron, still with his eyes closed.

‘Malfoy,’ replied Harry at once, certain his worst fear would be confirmed.

’ ‘Course,’ said Ron bitterly, stuffing the rest of the Frog into his mouth and taking another.

‘And that complete cow Pansy Parkinson,’ said Hermione viciously. ‘How she got to be a prefect when she's thicker than a concussed troll...’

‘Who are Hufflepuff's?’ Harry asked.

‘Ernie Macmillan and Hannah Abbott,’ said Ron thickly.

‘And Anthony Goldstein and Padma Patil for Ravenclaw,’ said Hermione.

‘You went to the Yule Ball with Padma Patil,’ said a vague voice.

Everyone turned to look at Luna Lovegood, who was gazing unblinkingly at Ron over the top of The Quibbler. He swallowed his mouthful of Frog.

‘Yeah, I know I did,’ he said, looking mildly surprised.

‘She didn't enjoy it very much,’ Luna informed him. ‘She doesn't think you treated her very well, because you wouldn't dance with her. I don't think I'd have minded,’ she added thoughtfully, ‘I don't like dancing very much.’

She retreated behind The Quibbler again. Ron stared at the cover with his mouth hanging open for a few seconds, then looked around at Ginny for some kind of explanation, but Ginny had stuffed her knuckles in her mouth to stop herself giggling. Ron shook his head, bemused, then checked his watch.

‘We're supposed to patrol the corridors every so often,’ he told Harry and Neville, ‘and we can give out punishments if people are misbehaving. I can't wait to get Crabbe and Goyle for something....’

‘You're not supposed to abuse your position, Ron!’ said Hermione sharply.

‘Yeah, right, because Malfoy won't abuse it at all,’ said Ron sarcastically.

‘So you're going to descend to his level?’

‘No, I'm just going to make sure I get his mates before he gets mine.’

‘For heavens sake, Ron—’