Dr. Napier continues to lament that most of her patients are women and children but John feels it's up to her to establish herself in the community. When she's told that her first patient of the day, Mrs. Kennedy, is a bit of a fusspot she only cursorily checks her son who is anything but cooperative. When she is later called to the house because of his worsening condition, she realizes the boy has diphtheria. Everyone is pleased beyond words when Brenda Maitland, John Finlay's one time fiancée shows up to help immunize the local children. At the chemists, Angus is slowly recovering but seems to have difficulty keeping up with his work. A case in point is the diphtheria antitoxin he has is out of date as he's behind in putting in his order. Their daily trips to the hospital to get a supply has unexpected consequences when they are run off the road by the distraught husband of one of Dr. Cameron's patients.