In a dystopian future, society is encapsulated in a domed city where every citizen's life is regulated by a computer. To maintain balance and conserve resources, individuals are only allowed to live until the age of 30. At this point, they are required to participate in a ritual called "Carrousel," where they believe they have a chance at being reborn. Logan 5 is a "Sandman," a member of an elite enforcement unit tasked with capturing "runners," those who attempt to escape their fate. When Logan is assigned to infiltrate a group of runners, he's unexpectedly ordered to undergo the process himself, experiencing firsthand the fear of mortality.

Logan partners with Jessica 6, a woman who supports the runners, and together, they embark on a perilous journey beyond the confines of their controlled environment. They discover a vastly different world outside and unravel secrets that challenge their beliefs. Their quest for freedom and understanding leads them to confront the truths hidden by their society, setting them on a course that could alter the future for everyone inside the domed city.