Fact1: Air Ministry calls on to investigate Hugh Drummond, Fact2: Petersen assisted by beautiful but deadly assassins and Pandora has developed number of robots with electronic brains, Fact3: Helga attempts to kill him by planting bomb in telephone after sleeping with him, Fact4: Drummond manages to open manually parachute and escape death, Fact5: trail leads Drummond to North Africa following up on lead on infrasound-powered powerboat
Output: A series of inexplicable accidents befall the development of the worlds first supersonic airliner, the SST1  a man falls victim to a homicidal air stewardess an uncredited Maria Aitken and two women Yutte Stensgaard and an uncredited Joanna Lumley perform separate acts of sabotage during tests. The Air Ministry calls on Hugh “Bulldog” Drummond Richard Johnson to investigate. Aided by ditzy American blonde Flicky Sydne Rome, Drummond uncovers a plot by criminal mastermind Carl Petersen James Villiers, who stands to gain eight million pounds if the aircraft is not ready by a certain date. Petersen, assisted by beautiful but deadly assassins Helga Daliah Lavi and Pandora Beba Loncar, has developed a number of robots: beautiful girls with electronic brains to help him sabotage the SST1 project by means of infrasound sound waves with too low frequency to be detected by the human ear which can be directed at people or objects with devastating results. After the initial sabotage attacks by Petersons robots, Helga and Pandora begin systematically murdering various people associated with the SSTI, such as engineer Dudley Mortimer Maurice Denham and Miss Mary Robert Morley, a spy who runs a cooking class as a front for his activities. Helga makes contact with Drummond at a shooting party, and attempts to kill him by planting a bomb in his telephone after sleeping with him. Then Helga and Pandora try to kill Drummond again by sabotaging a glider fight, having cut the ripcord from his parachute. Drummond manages to manually open his parachute and escape death. The trail leads Drummond to North Africa, following up on a lead on an infrasoundpowered powerboat, where he is assisted by Peregrine Carruthers Ronnie Stevens from the British Embassy. Pandora kills the boat owner with a miniature infrasound device, but is thwarted in her attempt to steal the boat. Drummond and Peregrine decide to drive the powerboat in a scheduled race: Helga and Pandora also participate in the race and successfully capture the men and the boat, delivering them all to Petersen at his island headquarters, staffed by an army of his female robots, including the defective but endearing No. 7 Vanessa Howard. Drummond and Peregrine are also reunited with Flicky, who has successfully infiltrated Petersens organisation. Over dinner, Petersen reveals the full details of his plan to use infrasound technology to sabotage the SST1s maiden flight. That night, Drummond sleeps with Helga once more, while Pandora contents herself with seducing Peregrine. In the morning, Drummond attempts to retrieve the infrasound powerboat and is met by Flicky, who tells him she is actually a CIA agent assigned to help him. They are caught by Helga  Drummond escapes but Helga holds Flicky at gunpoint. Petersen sends his robots to search the island for the runaway agent  Drummond is cornered by No. 7, but to his surprise, she deliberately chooses not to reveal his location. Peregrine and Flicky are held hostage in Petersens control room and are forced to witness the SST1s destruction as he puts his plan into action. Drummond scales the wall of Petersens hideout, and saves the SST1 from destruction by using Petersens infrasound waves against him, destroying his control room. Petersen, Pandora and Helga are all apparently killed in the explosion. Drummond, Flicky, Peregrine and No. 7 escape the subsequent mayhem, having retrieved the infrasound device. Flicky reveals herself to be a double agent working for the Russians and escapes on the powerboat with the device. Peregrine, wanting to improve his Russian relations, decides to go with her. As the base finally explodes, Drummond finds comfort in the arms of the beautiful No. 7.