When the Master of Gresham College is found dead at the foot of the University Observatory stairs, Lewis (Kevin Whately) and Hathaway (Laurence Fox) find that the finger of suspicion points at the staff.

When the Master of Gresham College, an amateur astronomer, is found dead at the foot of the University Observatory stairs, Lewis (Kevin Whately) and Hathaway (Laurence Fox) find that the finger of suspicion points at the staff.