In the midst of a heat wave, new nurse Sandy Wright begins work at the hospital. She's replacing Judy Loveday who left after not getting the Deputy Matron's job. Terence moves back to his flat above the clinic. Dr. Nigel Fairbairn, the locum brought in while Terence recovers, arrives in the valley. Vicky is immediately drawn to him but neither Simon nor Shirley think too highly of him. Karen Murdoch is brought into hospital to give birth but when complications bring about the possible need for her newborn daughter to receive a blood transfusion, doubts are cast on the baby's paternity. Karen's refusal to name the child's father, the last possible donor of a rare blood type, endangers her newborn daughter's life.