Ruth is called over to see Jenny, who has developed a fever - she thinks some placenta has been left behind after the birth, which must be removed. She needs surgical tools and drugs, which would only be readily available at a city hospital. The obvious choice of city is Birmingham. The risk of going into the city is high. Greg wants
to go, but Ruth feels he'll be more use at Jenny's side. Paul volunteers, and sets off at first light, on horseback.He is back the next day, on foot as his horse went lame on the way home. He has found all of the stuff Ruth had requested, but is feeling unwell. Ruth suggests he stays in the haybarn in case he has something infectious.
Ruth treats Jenny and successfully removes the placenta which was causing her problem. She turns her attention to Paul
who is now very sick. She dare not go near him, but instructs him on how to inject himself with some of the drugs he had brought back.
Paul continues to get sicker. He develops lumps under his arms and on his neck. Ruth thinks it is bubonic plague. The drugs should have done some good, so she concludes that this is a mutant strain.
The main characters meet to discuss the situation. They realise now that although they all survived the death, they
are not immune to all forms of plague. Also, they are in immediate danger as the plague is carried by rats, and they live on a farm. A suggestion comes up that as Paul is dying, maybe they should humanely finish him off, and burn the haybarn to the ground for the safety of them all.
Greg strongly vetoes that idea - he suggests that Paul is perhaps too ill to have injected himself properly, and that someone should do it for him. He makes a suit of
polythene sacks, and paints it with DDT mixed in paraffin, with the intention of doing it himself. Ruth insists that she does the job.
She comforts Paul, and tells him that his efforts saved Jenny's life. Obvously in great distress, she gives him an injection...
Arthur has been making a census of the community, encouraged by Charles, whose previous attempt had come to naught. His census reveals that it is in fact Paul's birthday, an also John's. They
have a party for John with all of the settlement's children. During the party they spot a fire in the haybarn.
Ruth burns the barn and disappears. They search all evening but cannot find her. They resume next morning, and Greg finds her in the woods. She is very disillusioned and had contemplated suicide.
They decide to learn from their experience, and set up a quarantine area for use on returning from such trips in the future, and for strangers who may
come to the community.
Jenny and Greg decide on the name for their new son - they call him Paul.