Dr. Shutt begins to do surgery again although his future in psychiatry is uncertain. A "suicide doctor" tries to get the hospital transplant committee to use organs that were not harvested properly, and promises one to Austin's patient without her consent. Sarin gas is released in a bank threatening many lives including Hancock's, who risks his own to save others. Wilkes loses it after the incident on the heels of the previous shooting at his son's school, leading him to take a drastic step. Diane returns to work after her maternity leave.