Piece of My Heart
| Episode Number | 13 |
|---|---|
| Season | 4 |
| Aired | 2008-05-01 |
| Overview | Addison visits Seattle Grace because they need skills that only she has. Rebecca/Ava returns with news for Alex. Meredith and Derek's clinical trial experiences one or two developments. |
| Runtime | 44 minutes |
| Absolute Number | 74 |
| Finale Type |