There is a legend about a great bell, called "The Mother of Voices," made of pure gold, three times the size of a man, made by monks many years ago... This is the story told in the marketplace by a Viking called Rolfe. This information finds its way to the Islamic ruler Aly Manush, who is obsessed with finding the bell. But Rolfe claims not to know where the bell is, and escapes, back to his homeland, to convince his father and brother to give him a ship and crew to replace the one he lost - or to help him steal the Death Ship which belongs to the king - because he does know where the bell is...

A series of unexplainable accidents befall the people and companies responsible for developing the world's first supersonic airliner (SST1). 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. The evil Petersen has developed a number of "robots" (actually rather beautiful girls with "electronic brains") to help him sabotage the SST1 project by means of "infrasound" (extreme low frequency sound waves) which can be directed at people or objects with devastating results.