Fact1: remnants of human civilization live in sealed city contained beneath cluster of geodesic domes including reproduction, Fact2: life-clock crystal in palm of hand changes color, Fact3: Most residents accept promise of rebirth, Fact4: elite team of policemen known as Sandmen are assigned to pursue Runners, Fact5: underground group leads them to periphery of city
Output: In the year 2274, the remnants of human civilization live in a sealed city contained beneath a cluster of geodesic domes, a utopia run by a computer that takes care of all aspects of their life, including reproduction. The citizens live a hedonistic life but in order to maintain the population levels everyone must undergo the ritual of Carrousel when they reach the age of 30. There, they are vaporized and ostensibly renewed. To track this, each person is implanted at birth with a lifeclock crystal in the palm of their hand that changes color as they get older and begins blinking as they approach their Last Day. Most residents accept this promise of rebirth, but those who dont and attempt to flee the city are known as Runners. An elite team of policemen known as Sandmen, outfitted in predominantly black uniforms and serving in an agency of the city called Deep Sleep, are assigned to pursue and terminate Runners as they try to escape. Logan 5 and Francis 7 are both Sandmen. After terminating a Runner, to whose presence they were alerted during a Carrousel ritual, Logan finds an ankh among his possessions. Later that evening, he meets Jessica 6, a young woman also wearing an ankh pendant. Logan takes the ankh to the computer, which tells him that it is a symbol for a secret group whose members help the Runners find Sanctuary, a mythical place where they will be safe to live out the rest of their lives; it points out that the Sandmen have lost one thousand and fiftysix Runners that way. The computer instructs Logan to find Sanctuary and destroy it, a mission he has to keep secret from the other Sandmen of Deep Sleep, which it codenames Procedure 03303. It then, by a procedure it calls retrogram, changes the color of his lifeclock to flashing red, making him suddenly four years closer to Carrousel. In order to escape Carrousel, Logan is now forced to become a Runner. Logan meets Jessica and explains his situation. They meet with the underground group that leads them to the periphery of the city. Logan finds that the ankh symbol is actually a key that unlocks an exit from the city. They come out into a frozen cave, with Francis following closely behind. In the cave, they meet Box, a robot designed to capture food for the city from the outside. Logan discovers to his horror that Box also captures escaped Runners and freezes them. Before Box can freeze Logan and Jessica, they escape, causing the cave to collapse on the robot. Once outside, Logan and Jessica notice that their lifeclocks are no longer operational. They discover that the remains of human civilization have become a wilderness. They explore an old, seemingly abandoned city, which was once Washington, D.C. In the ruins of the United States Senate chamber, they discover an elderly man. His appearance is a shock to them, since neither has seen anyone over the age of 30. The old man explains what he remembers of what happened to humanity outside the city, and Logan realizes that Sanctuary is a myth and had been all along. However, Francis has followed them and he and Logan fight. Logan fatally wounds Francis and as he dies, he sees that Logans lifeclock is now clear and assumes that Logan has renewed. Logan and Jessica persuade the old man to return to the city with them as proof that life exists outside the domed city. Leaving the man outside, the two enter and try to convince everyone that Carrousel is a lie and unnecessary. The two are captured by other Sandmen and taken to the computer. The computer interrogates Logan about Assignment 03303 and asks if he completed his mission, but Logan insists, There is no Sanctuary. What he had found was old ruins, exposed, an old man, and that the missing Runners were all frozen. These answers are not accepted by the computer, even after scanning Logans mind, and the computer overloads, causing the citys systems to fail violently and release the exterior seals. Logan, Jessica, and the other citizens flee the ruined city. Once outside, the citizens see the old man, the first human they have met who is older than 30, proving that they can, indeed, live their lives much longer.