A series of scientists working on a new techology to facilitate man's conquest of space are killed in mysterious circumstances. Suspicion falls on the wife of another scientist on the project, who may not be what she seems.
John Neville
as Dr. Mark Davidson
Philip Stone
as Prof. John Lancaster
Gabriella Licudi
as Julie Davidson
Patrick Newell
as Maj. Clarke
Jean Marsh
as Miss Ballard
Warren Mitchell
as Prof. Munro
