Everything Changes (A Grey's Anatomy Fanfic)

Mark survived. Derek didn't die. Alex stayed.
Everything that went wrong since the plane crash changed.
The one thing these events have in common?
Lydia Shepherd.
Lydia Shepherd is the secret, self-proclaimed black sheep of the Shepherd family. She's the only one to not become a doctor. She started herself and Amelia down the path of drugs. Everything in her life has gone wrong.
Until now.