A woman named Molly writes regularly to a man called Mr. Hope about the thriving oil field he discovered, envisioning a bright future with electric lights and cars for every household. Fourteen years after Luke's death, Molly sends a letter revealing she joined a medical team in Westby and carries Luke’s engagement necklace. Meanwhile, someone urges Lucy to join the last team heading to Walby, warning her that refusing means losing any chance of promotion forever. The episode ends with Lucy facing the difficult decision to go or miss out on her future.