On the train at the end of his third year, Harry receives something other than the letter from Sirius, something better than he could have ever imagined he would.

What could have happened on the night of the attack? The communication mirror saved James's life, but what will he do without Lily and Sirius? Can he save them? Can he stand not to?

They say that before you die your life flashes before your eyes. His life was her. His life is already gone. Remus/Tonks, Battle of Hogwarts.