Robert has been invited by wealthy Alice Costigan to her country house for a shooting party. He has high hopes of furthering his personal relationship with his hostess, but soon discovers that he has a rival for her affections, in the person of eminent Harley Street physician Aubrey Savier.
During Robert's absence, Finn O'Neill returns to London for one day on his return route to America, and Eleanor invites him to stay the night. In the morning, they agree to marry upon his return next June.
After returning to London, Alice stops by the Bramwells' house to return Robert's watch, which he had left behind. But her infant nephew Theo is clearly ill, and when Robert diagnoses an interseseption of the bowel he advises immediate surgery. Alice, however, is averse to the idea (her late husband had died "under the knife") and calls in Aubrey Savier, who suggests inflation of the bowel as an alternative. Next day, however, little Theo is worse than before and Robert, now with Eleanor's support, finally convinces Alice Costigan of the necessity for surgery. Savier is livid, and threatens action against Robert.
Joe Marsham has been offered a better-paying position in Edinburgh by his former mentor Dr. Watson.