Hannah's parents fly her back to Michigan to celebrate their 30th wedding anniversary. Though they hope she'll go on their date, she gets one of her own instead, and catches up with some high-school friends who are mourning a hometown tragedy.
Goodwin is forced by the hospital board to implement new guidelines that cause headaches for the doctors; Dr. Rhodes and Ava continue to compete in the operating room; Dr. Charles and Dr. Reese are surprised by a patient's theory about his sickness.
A shooting in a school parking lot leaves one person dead, another person critically wounded and a car loaded with marijuana. Brenda and Fritz, meanwhile, spar over how to handle Charlie (recurring guest star SOSIE BACON), especially after Brenda brings her niece into the middle of the case. Provenza, decides to make a big life change.
Will makes Alicia a stunning offer which causes her to reconsider her plans to leave the firm. Also, the partners take action when Diane's Supreme Court candidacy puts her at odds with her colleagues.
When a bomb is detonated in the morgue, Watson and Holmes must look for a killer without any physical evidence to assist them; Watson is asked to consult on a case by a detective who has a grudge against her.