The Proud Man's Contumely
Canon divergent - Post-OotP fic.
While still reeling from Sirius' death, a plot on Harry's life costs him more than just the protections of his familial home. The young man finds unexpected comfort in his new guardian, but Voldemort takes increasing advantage of Harry's instability. Little does the Dark Lord know, an old enemy with an abiding grudge is teaching Harry a new trick she thinks will end the fiend once and for all. Meanwhile, villainy hides in plain sight, relationships blossom and change, secrets are revealed, enemies become friends and vice versa. However, Harry soon starts to suspect his worst enemy might just be himself.
Major Character Death warning
First in the Dark Creatures Trilogy