A secret jet aircraft capable of traveling three times the speed of sound is being developed by a group of scientists. On the day of the test flight, one of the scientists dies in a mysterious accident, and there are many arguments concerning the flight itself; some think it should be ground-controlled while Heathley (James Donald) wants it to be a manned flight with himself at the controls. Conflict also arises when one of his fellow scientists, taking advantage of Heathley's lack of attention toward his wife, Lydia (Phyllis Calvert), makes some moves on her. Then there is the question of just who is the enemy agent on the project.

Angela Bennett is a freelance computer systems analyst who tracks down software viruses. At night she hooks up to the internet and chats to others 'surfing the net'. While de-bugging a new high-tech game for a cyber friend, she comes across a top secret program and becomes the target of a mysterious organization who will stop at nothing to erase her identity and her existence, in order to protect the project.