"So, a few weeks after I turned to Albus, he had discovered that his side had a spy in their midst. This spy was passing along vital information to the Dark Lord about Albus’ Order, the same way I was doing for Albus. I tried hard to discern the identity of the spy but I did not know who it was until the Dark Lord had been destroyed. I keep on wondering if I knew who it was or had any suspicions about his identity, because my memories have a gap during a long period around the end of April in that year. Had that gap not been there, then perhaps... maybe I could have stopped James Potter from making the wrong person his secret keeper."