Holmes and Watson are on the hunt for a serial killer and Holmes neurological recovery dangerously regresses.
Elizabeth heads to Africa for a development aid discussion, but is surprised to find that Chinese officials are looking to undercut their offer.
Elizabeth targets an old source who could tip the balance of the upcoming summit, as Philip deals with business at the travel agency; Stan learns an old friend is back in town.
After picking up a distressing piece of intelligence, Elizabeth takes extreme measures to get close to a Soviet negotiator. Philip shares some stunning news with Henry.