Starved of companionship, Mrs. Black releases her son from Azkaban on a technicality that frees him but fails to clear his name, leaving him despised by the wizarding community. Mrs. Black's plans for Sirius to return to his familial duties and marry a pureblood witch are foiled by his righteous insistence on reclaiming his innocence and raising the son of his deceased best friend.

A sixteen-year-old Sirius Black mysteriously falls forward into a time where he is reviled as a mass murderer, his best friend is dead because of him, and everything he knows is gone. (Begins in CoS)