A series of unexplainable accidents befall the people and companies responsible for developing the world's first supersonic airliner. A British agent is sent to investigate and with the help of another agent uncovers a plot masterminded by Carl Petersen who stands to gain eight million pounds if the aircraft is not ready by a certain date.

• Ashdown Film Productions
• The Rank Organisation
• Richard Johnson
• Daliah Lavi
• Beba Lončar
• James Villiers
• Vanessa Howard
• Maurice Denham
• Robert Morley
• Sydne Rome