Syd believes that a patient she Dr. Sullivan are treating has Muchausen Syndrome which causes a mother to make a child purposely sick in order to seek immediate medical attention. Dr. Sullivan tells Syd that she was treated a year earlier and the results showed no symptoms of the disease. The doctor believes that the patient is being poisoned.
In this season's opener, an out-of-control Mercedes smashes through a wall of the clinic; Molly, a mentally disturbed and dellusional young woman, holds Syd (Melina Kanakaredes) at gunpoint because she thinks she kidnapped her baby; and Helen contemplates a new career, away from the clinic. Meanwhile, Joanie hires Doug Dog Boy Boyce to help her out at the Barkery.