On the first anniversary of Lynda's death, the Hansens agree to celebrate her life with a memorial dinner until Jim causes a family uproar when he confesses that a missing secret letter that he wrote to his wife just before her fatal heart attack might have caused the calamity. Elsewhere, Sydney stays close to the athletic Kyle when he learns he must undergo a traumatic surgery. Joanie must make a painful decision when she discovers that the obedient employee in her dog store eatery has been behaving more and more like a canine.
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.