Derek finds an old diary of Meredith's mother; Callie anxiously prepares for her first real date with Erica; Cristina stumbles into a part of the hospital that she and the other residents have never seen.
The team and Coast Guard Investigative Services join forces when a Navy diver seeking sunken treasure is murdered.
The president green-lights a raid on the homegrown terrorists, while the staff try to negotiate more debates with Bartlet's Republican rival.
Young lawyer Ally McBeal joins a Boston law firm and struggles to control her complicated personal life.
A college professor is disgraced when he is accused of murdering one of his female students. He pleads for Rush to reopen the case.