In the year 2274, the remnants of human civilization live in a sealed domed city, a utopia run by a computer that takes care of all aspects of their life, including reproduction. The citizens live a hedonistic lifestyle but understand that in order to maintain the city, every resident when they reach the age of 30 must undergo the ritual of "Carrousel" [sic]. There, they are vaporized and ostensibly "Renewed." To track this, they are implanted at birth with a "life-clock" crystal in the palm of their hand that changes colors as they approach their "Last Day."