Doppelganger

It was a year after the war, and Harry was doing well. He and Draco had buried the hatchet and were running the Children of War Foundation together. All in all Harry was doing well; he should have known it wouldn't last. When Harry starts to hear noises and see things that shouldn't be, will he find it is all in his head, or is something sinister lurking? Warnings: AU, Not Betaed