A new doctor at Seattle Grace puts others on edge; Arizona struggles with phantom limb pain; Meredith is faced with her worst fear.
The team joins forces with the State Department, after an arms dealer's death is linked to a slew of crimes that seem to be carried out by someone with elite special forces training.
Jane and Maura investigate when a woman's body is found encased in a statue.
Alison attempts to regain her position as leader of the gang upon her return to Rosewood High; a depressed Aria seeks comfort from an unlikely source.
A double murder case leads the detectives to an influential church organisation.