Roy Parmenter is an FBI agent in San Diego; 20 years ago his partner was killed by a Soviet spy, nicknamed Scuba, still at large. Scuba is now trying to extort the Soviets; to prove he's serious, he's killing their agents one by one, including "sleepers," agents under deep cover awaiting orders. Roy interviews a high school lad, Jeff Grant, an applicant to the Air Force Academy. In a routine background check, Roy discovers that Jeff's parents are sleepers. He must see if Jeff is also a spy, confront the parents yet protect them, and catch his nemesis. Meanwhile, the Soviets have sent their own spy-catcher, the loner Karpov, to reel in Scuba. Alliances shift; it's cat and mouse.

A chemist experimenting with different formulas stumbles upon an ingredient that, when added to beer, makes it absolutely irresistible. Before he realizes it, an international spy is after him to try to get the formula for himself.