Hedwig Through the Veil (джен)

Hedwig is a very special owl. Harry had always known that. But even he doesn't realize how special she is and the lengths she would go for him. After the Department of Mysteries fiasco Harry writes one last letter to Sirius for some closure. Not sure what to do with it, he leaves it on his desk. When Hedwig notices the letter, she takes it to deliver it. What happens when she comes back? From Chartry and her Emmi’s prompt collection on AO3.