Larry Brandenburg

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.

An officer is suspected of using steroids; a detective admits to an affair with a drug-addicted snitch after the woman is found dead.

Sipowicz's unresolved feelings about his son's death resurface; Fancy seeks retribution when two cops accost him and his wife.

Bill gets a strange mandate from Zippy; Tina lets the Yost family know that she is back in town.

Butchie and Kai have a joyous revelation; Imperial Beach plays host to a makeshift parade.

An alcoholic cop can't remember the details of a double homicide in which he appears to have been involved.