Children's drama series following the lives of students and teachers at Grange Hill comprehensive school.

Colin is the deputy principal of a city high school (Avondale College, Auckland) who reluctantly applies for the principal's job on the latter's retirement. Colin's wife, Elizabeth - who is losing interest in him -gives a dinner party. Among the guests is Judy, temporarily reconciled with her husband for the sake of the children. Colin - who has taken upon jogging to combat a spreading waistline - and Judy, gradually enter into an affair.