 There, they are killed under the guise of being "renewed”.To track this, each person is implanted at birth with a "life-clock" crystal in the palm of the hand that changes color as they get older and begins blinking as they approach their "Last Day.” Most residents accept this chance for rebirth, but those who do not 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.