The Headmaster and governors of a boarding school are accidentally locked in the new memorial room with the convicted Great Train Robbers.
Richard Pearson
Headmaster
John Le Mesurier
Canon Dunwoodie
Barbara Couper
Mrs Craxton-Christie
Jane Eccles
Miss Plimsoll
Stanley Meadows
Lionel Smeed
Priscilla Morgan
Beryl Smeed