"Peter gave them up to Voldemort. Seems like he was already in the inner circle by that point. I just hadn't seen it. I couldn't even imagine it, Merlin... I underestimated him until the end." Sirius shook his head, the events flashing by his eyes. He had seen it all too late. "After their murder, after I'd found Harry in what was left of the house, I went after Peter. Hunted him down. He exploded part of a street. Twelve muggles dead. And he got away."

Sirius laughed, because he couldn't help it. Whenever he got to that point, it was all he could do. "They caught me, sentenced me. Didn't get a trial. Everyone thought I was secret keeper."