A team of research scientists believe they have discovered a superior intelligence. Jim Tanner (George Hamilton) and his pretty partner Margery Lansing (Susan Pleshette) have discovered the entity through their work on human endurance. The Power is able to control the minds of others, but Jim can't substantiate his suspicions that the force comes from one of the members of the scientific staff. A series of murders has Jim under suspicion by the police, as he tries to uncover the identity of the killer. Yvonne De Carlo, Earl Holliman, and Miss Beverly Hills also star in this sci-fi mystery.