First broadcast 30th October 1979.
With Sapphire as a medium, Tully and Steel are able to communicate with the ghost of a woman who was once the soldier's schoolteacher.
David McCallum ... Steel
Joanna Lumley ... Sapphire
Gerald James ... Tully
Tom Kelly ... Pearce
David Woodcock ... 1st Submariner
David Cann ... Pilot
