 Thrush is using a fencing school in Mexico as a cover. Inside, young men are being trained to be "perfect" killers. They can even turn emotion on and off. Professor Stoller, the head of the operation, has selected his prize pupil, Greg Martin, to demonstrate how effective the trainees can be. Martin is to blow up a dam in Greece and destroy a small town in the process. Solo and Kuryakin desperately try to stop the young Thrushman. Complicating matters is a young woman who has fallen in love with Martin.