"They knew. They're dead now, Remus. Do you even know that?" Sirius snapped. He didn't mean to lash out, at least not at Remus, but he was the only other person in the room. And with his hand entwined with Sirius's, he couldn't exactly get up and start wrecking the room. Not that it would be acceptable to do that anyway.

"It doesn't matter what they thought now. Merlin, it was a terrible plan. I should have known-- don't know why I never saw it..."

Of course the traitor was Peter.