Derek and Addison face off as they try to save a pregnant patient's life; a surgeon botches a standard procedure; Bailey is shocked by the chief's recommendation letter.
Derek looks for the perfect way to propose to Meredith; Lexie wants Mark to go public with their relationship; Bailey considers taking her medical career in a new direction.
Ally and John take the case of a wrongful death that Richard thinks will profit the firm; Ally and Glenn discuss their feelings for each other.
An irrational woman tempts fate and pays the ultimate price; McDowell gets a new partner with questionable competency.