The US President has just been handed an ultra-secret report showing that the bugs have won and that the insect population will denude most of the planet by the end of the 80s, with world famine unavoidable. Luckily, however, biochemist Allan Vaughn has been studying fish pheromones and chemotaxis, synthesizing fish sex odors so that fish ranches can be engineered to produce limitless protein. But. . . now Vaughn has disappeared, and his partner Lundberg has had his head blown off with a letterbomb. The Japanese are after Vaughn's sea-file, you see; they've loosed the dreaded Ninja assassins on Vaughn's tail. So who will the President (who is trying to destroy the CIA and build a personal spy army) call in to find Vaughn? Super-agent and karate grandmaster Spargo (hero of an earlier Scott suspenser)--who, though retired and in mourning for his dead love Salwa (murdered on his last mission), takes the job. He traces Vaughn to Cape Cod and is astounded to find that Vaughn's beauteous assistant Harla is a ringer for Salwa--and a double agent for the Japanese. Many, many die (including sexy Harla), but the President does finally get his fish ranches. Dumb thriller stuff, only slightly redeemed by the (mostly silly) pseudo-science.