Scott Carey and his wife Louise are sunning themselves on their cabin cruiser, the small craft adrift on a calm sea. While his wife is below deck, a low mist passes over him. Scott, lying in the sun, is sprinkled with glittery particles that quickly evaporate. Later he is accidentally sprayed with an insecticide while driving and, in the next few days, he finds that he has begun to shrink. First just a few inches, so that his clothes no longer fit, then a little more. Soon he is only three feet tall, and a national curiosity. At six inches tall he can only live in a doll's house and even that becomes impossible when his cat breaks in. Scott flees to the cellar, his wife thinks he has been eaten by the cat and the door to the cellar is closed, trapping him in the littered room where, menaced by a giant spider, he struggles to survive.

Some college students manage to persuade the town's big businessman, A. J. Arno, to donate a computer to their college. When the problem- student, Dexter Riley, tries to fix the computer, he gets an electric shock and his brain turns to a computer; now he remembers everything he reads. Unfortunately, he also remembers information which was in the computer's memory, like the illegal business Arno is involved in.

Detective Virgil Tibbs is caught up in the racial tension of the US South when he is arrested after the murder of a prominent businessman. Tibbs was simply waiting for his next train at the station in Sparta, Mississippi and the confusion is soon resolved but when local police chief Gillespie learns that Tibbs is the Philadelphia PD's number one homicide expert, he reluctantly asks for his assistance. The murdered man, Mr. Colbert, had come to Sparta from the North to build a new factory and his wife and business associates immediately point the finger at Endicott, the most powerful man in the county and the one who had the most to lose if a major new employer comes to the area. Tibbs' life is clearly in danger but he perseveres in a highly charged and racially explosive environment until the killer is found.

A security agent investigates sabotage and murder at a secret underground laboratory, home of two experimental robots.