Overview
Hans Daedalus has defected from East Germany to the West. Is it possible that his opacity equations live on after his death?
Cast
- Michael Bryant as Sam McInstrey
- Megs Jenkins as Eileen Gray
- Peter Sallis as Major Venables
- Estelle Kohler as Mary Stannage
- Richard Hurndall as Sherborne
- George Coulouris as Hans Daedalus
- Eve Mortimer as Madge Baxter
- John Atkinson as Perry
- Rod Beacham as Sergeant Riley
- Elizabeth Choice as Woman at Seance