Hugo is a brilliant turn-of-the-century scientist, loved and respected by his family and friends, admired by his colleagues. But he is a man quickly becoming obsessed with a curious and frightening question... what is the mysterious apparition found in the photographs of his dying subjects?

• Glendale
• Robert Powell
• Robert Stephens
• Jane Lapotaire
• Alex Scott
• Ralph Arliss
• Fiona Walker
• Terry Scully
• Tony Caunter