A wealthy inventor arrives at Grey Sloan and asks Koracick for help. Meredith struggles to save a woman with diabetes who has been rationing her insulin. Jo and Link fight to save a young man who fell onto train tracks.
Philip and Elizabeth disagree over handling orders from the Centre; Philip enlists Annelise on a mission with an unexpected outcome; Stan tries a new approach to mending his marriage with Sandra amidst learning tough news about Nina.
Elizabeth and Philip come together to deal with a mission gone wrong, but struggle to reconcile their ideologies; Stan welcomes a Soviet defector to America; Nina acclimates to her new living arrangements.
Having revealed their true identities to their daughter Paige, Philip and Elizabeth must keep her best interests at heart while ensuring that they remain protected.
A shocking new development in Wiliam's work leads the Jennings to face the dangerous realities of a biological war.