Cooper struggles with the mother of a patient after learning she allows the 12-year old to be sexually active. Violet is jealous after Pete begins dating a patient's mom. Meanwhile, Sam is scheduled to testify at a colleagues trial for malpractice; and Addison continues to fight her romantic feelings for Noah.

Addison sends a pregnant woman to St. Ambrose for help from Noah after she experiences heart complications. Meanwhile, Sam begins to rethink his friendship with Naomi; Pete and Lisa's relationship becomes increasingly complex; and Sheldon takes a stand.