Shroud For A Nightingale 1984 EPISODE 5 Part 1 of 2

When a student nurse with a penchant for petty blackmail is lethally poisoned during a routine procedure, Commander Dalgliesh and Inspector Massingham have to discover which, of the many guilty secrets held by the staff and students at Nightingale House, was a strong enough motive for murder. Roy Marsden, Joss Ackland, Sheila Allen