The Fidelius Kept Secret

After the meeting in the Hogs Head and talking with Sirius, does Harry come to a shocking discovery that breaks his heart and makes him make a drastic decision. A decision that will test the friendship between him and his Quidditch Team. Will they succeed? Will they be able to do what Peter Pettigrew couldn't? Can they keep the secret, even from Dumbledore? And what about the war?