In 2019, Lincoln Six Echo and Jordan Two Delta live with others in an isolated compound. Their community is governed by a set of strict rules. The residents believe the outer world has become too contaminated for human life with the exception of one contagion-free island. Every week, a lottery is conducted and the winner gets to leave the compound to live on the island.
Lincoln begins having dreams that he knows are not from his own experiences. Dr. Merrick, a scientist who runs the compound, is concerned and places probes in Lincoln's body to monitor his cerebral activity. While secretly visiting an off-limits power facility in the basement where his friend, technician James McCord, works, Lincoln discovers a live moth in a ventilation shaft, leading him to deduce the outside world is not really contaminated. Lincoln follows the moth to another section, where he discovers the "lottery" is actually a system to selectively remove inhabitants from the compound, where the "winner" is then used for organ harvesting, surrogate motherhood, and other purposes for each one's sponsor, of whom they are identical clones.