Addison flirts with a colleague at St. Ambrose Hospital; Sheldon and Pete try to convince Violet to take a paternity test; Sam accidentally calls Sonya by the wrong name.

A disturbed pregnant patient has lost her baby, and Violet must convince her that her baby needs surgery. Meanwhile, Cooper must tell a patient he needs part of his jaw removed due to a fast-growing cancer. Dell must cope with his daughter's absence when his ex has to move for a new job Sam and Addison must hold back their feelings for two unattainable people.

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.

As Violoet chooses between Pete and Sheldon, she must also deal wtih a grief-stricken patient. Meanwhile, Dell worries about his daughter when Heather returns to town and Naomi debates moving to Pacific Wellcare.

Miranda Bailey brings a kidney transplant patient to Los Angeles, and Addison and especially Sam is pleased to see her. Addison's consequences of her emotional affair with Noah catch up with her. Sheldon and Pete finally discover who the father of Violet's baby.