Plot[]
Robert Scott Carey is on vacation with his wife, Louise, when a strange mist envelops him. Six months later, he observes that his clothes are too large, suspects he is shrinking, and seeks medical advice. Initially, his doctor denies that Carey is shrinking. Later, the doctor confirms the shrinking through X-rays and refers him to a medical research institute. The institute determines that Carey's exposure to the mist, combined with earlier exposure to a pesticide, rearranged his molecular structure, causing him to shrink. Carey informs Louise that, given his predicament, she is free to leave him. Louise promises to stay, and as she does, Carey's wedding ring slips off his finger.
Carey's condition turns him into a national curiosity. Media attention forces him into seclusion within his home. Advised to sell his story, Carey starts a journal detailing his experiences. An antidote is discovered, halting his shrinking, but doctors caution that he will remain three feet tall for the rest of his life unless a solution is found to reverse his condition. Emotionally shattered, Carey meets Clarice, a carnival worker and dwarf, who is exactly his height. Clarice encourages Carey, inspiring him to continue his journal. Later, he notices he is now shorter than Clarice and dejectedly runs home.
Carey shrinks small enough to live in a dollhouse and becomes more tyrannical. When Louise leaves home on an errand, he falls into his basement after Butch, the family cat, attacks him. Louise returns and assumes Butch ate Carey after finding a bloody scrap of Carey's clothing. Louise prepares to move out, with Carey's brother, Charlie, assisting.
Carey faces significant challenges navigating his basement. The water heater bursts, but when Charlie and Louise come to investigate, Carey is too small for them to hear his screams for help. He battles a large spider while searching for food and shelter. He ultimately kills the spider with a straight pin and collapses in exhaustion. He awakens, small enough to escape the basement through one of the netting squares of a window screen. Carey accepts his fate of shrinking to microscopic size. He is no longer afraid, concluding that no matter how small he becomes, he will still matter in the universe because God will know he exists.