It's the summer of 1967, and a heatwave descends over Poplar. Sister Hilda and Dr Turner support a young father with a lung condition, and Trixie takes the lead with a struggling first-time mother. Cyril continues to search for a new job that will put his civil engineering qualification to use and pay more so he and Lucille can afford a house deposit, but Lucille receives unexpected news that she must break to him. Meanwhile, Trixie and Matthew's relationship is going well, but Trixie wants a little more romance.