What Happened to Monday

In 2073, overpopulation causes a worldwide crisis, resulting in a strict one-child policy enforced by the Child Allocation Bureau. When multiple children are born to one mother, all but the eldest are put into cryosleep. Karen Settman dies when she gives birth to identical septuplet sisters. Their grandfather Terrence names them after the days of the week and trains them to pose as a single individual named after their mother, and to leave the house only on the day of their name. To safeguard their secret, Terrence ensures they share information on a daily basis and replicates any accident that affects one of the sisters' physical appearance. The sisters develop a system of wigs and makeup to cover any identifying features. Read more on Wikipedia.