Set in the future, the story follows a young soldier named Johnny Rico and his exploits in the Mobile Infantry. Rico's military career progresses from recruit to non-commissioned officer and finally to officer against the backdrop of an interstellar war between mankind and an arachnoid species known as "the Bugs".

The Law Enforcement Technology Advancement Centre (LETAC) has developed SID version 6.7: a Sadistic, Intelligent, and Dangerous virtual reality entity which is synthesized from the personalities of more than 150 serial killers, and only one man can stop him.

A hit man's boss refers him to a client, a dangerous woman who mixes business with pleasure.