Some Girls Do

The development of the world's first supersonic airliner, the SST1, experiences a series of inexplicable accidents, including a homicidal air stewardess attack and sabotage by two women during tests. These incidents hinder the progress of the aircraft's development, raising suspicions of foul play. The Air Ministry becomes concerned and seeks an investigation.

The Air Ministry calls upon Hugh 'Bulldog' Drummond to investigate the sabotage and uncover the mastermind behind the attacks. Drummond begins his inquiry, assisted by Flicky, an American blonde with seemingly a scatterbrained demeanor but with crucial intelligence.

Drummond uncovers that Carl Petersen, a criminal mastermind, is behind the sabotage, aiming to profit eight million pounds if the SST1 is not completed on time. Petersen uses robotic agents with electronic brains to carry out sabotage using infrasound technology to thwart the project.

Petersen's female robots, Helga and Pandora, carry out targeted acts of sabotage and systematically murder key individuals involved with the SST1 project, including engineer Dudley Mortimer and spy Miss Mary. Their actions intensify the danger surrounding the aircraft's development.

Helga contacts Drummond at a shooting party and attempts to kill him by planting a bomb in his telephone after seducing him. Later, she also tries to crash a glider into him, but Drummond escapes by manually opening his parachute after the sabotage of his ripcord.

Following clues, Drummond travels to North Africa to investigate an infrasound-powered powerboat linked to Petersen's operations. He is assisted by Peregrine Carruthers from the British Embassy, as Pandora attempts to kill the boat's owner with a miniature device.

Drummond and Peregrine enter a scheduled race with the powerboat, which is also participated in by Helga and Pandora. During the race, Petersen's agents capture Drummond, Peregrine, and Flicky, bringing them to his island headquarters staffed by female robot workers, including No. 7.

At the island, Petersen explains his plan to use the infrasound technology to sabotage the SST1's maiden flight. Meanwhile, Drummond seduces Helga again, and Pandora also tries to manipulate Peregrine during this confrontation.

Drummond attempts to retrieve the infrasound device, aided by Flicky, who reveals herself as a CIA agent. The team rescues Peregrine and Flicky, as Petersen's robots search for them. Drummond ultimately destroys Petersen's control room, thwarting the sabotage plan and apparently killing Petersen and his accomplices.

Flicky, revealed as a double agent working for the Russians, escapes with the infrasound device on a powerboat. Peregrine also leaves with her to improve Russian relations. Drummond and No. 7, who is not a robot, share a moment of comfort as the base explodes, ending Petersen's threat.