Harry suddenly realized that there were tears on his face mingling with the sweat. He bent his face as low as possible, wiping them off on his robes, pretending to do up his shoelace, so that Lupin wouldn't see. 

"You heard James?" said Lupin in a strange voice. 

"Yeah..." Face dry, Harry looked up. "Why -- you didn't know my dad, did you?" 

"I -- I did, as a matter of fact," said Lupin. "We were friends at Hogwarts. Listen, Harry -- perhaps we should leave it here for tonight. This charm is ridiculously advanced.... I shouln't have suggested putting you through this...."

 "No!" said Harry. He got up again. "I'll have one more go! I'm not thinking of happy enough things, that's what it is.... Hang on...." 

He racked his brains. A really, really happy memory... one that he could turn into a good, strong Patronus... 

The moment when he'd first found out he was a wizard, and would be leaving the Dursleys for Hogwarts! If that wasn't a happy memory, he didn't know what was.... Concentrating very hard on how he had felt when he'd realized he'd be leaving Privet Drive, Harry got to his feet and faced the packing case once more. 

"Ready?" said Lupin, who looked as though he were doing this against his better judgment.

"Wait!" shouted Amelia. She sat down on the cold stone floor and then laid down on her back, giving a thumbs up, "Proceeded."

"Concentrating hard? All right -- go!"

He pulled off the lid of the case for the third time, and the dementor rose out of it; the room fell cold and dark

"EXPECTO PATRONUM!" Harry bellowed. "EXPECTO PATRONUM! EXPECTO PATRONUM! " 

The screaming inside Harry's head had started again -- except this time, it sounded as though it were coming from a badly tuned radio -- softer and louder and softer again -- and he could still see the dementor -- it