"Finger," Sirius finished the sentence. "Dirty coward cut it off so everyone would think he was dead. Then he transformed into a rat."
Harry stared into Sirius' sunken eyes. He wanted to believe. He was desperate to believe. He glanced at Ron, at the agony apparent in his face, even as Scabbers squirmed violently.
"Show me," he said at last.
Remus and Sirius turned to Ron, who held Scabbers protectively. "What are you going to do to him?" The two men exchanged a glance.