When the master of a college is found dead at the foot of the observatory stairs, suspicion falls on all of the staff - from senior tutors right down to the scouts.
Quest roles:
Liz Crowther(Mrs. Leeming), Warren Clarke(Roger Temple), Deborah Cornelius(Dr. Ella Ransome), Sophie Ward(Isobel Crompton), Robert Hardy(Sir Arnold Raeburn), Diana Quick(Gwen Raeburn), Annabelle Apsion(Babs Temple), Andrew Hawley(Jez Haydock), Bernard Lloyd(Ted Temple), Christopher Bowen(Professor Andrew Crompton)