2073. The Earth is overpopulated. The government decided to introduce a one-child policy, applied by the Birth Control Board, under the aegis of Nicolette Cayman (Glenn Close). Confronted with the birth of seven twins, Terrence Settman (Willem Dafoe) decides to keep the existence of his 7 granddaughters secret. Confined to their apartment, each day they will have to share a unique identity outside, simulating the existence of one person: Karen Settman (Noomi Rapace).

Though the secret remains intact for years, everything collapses on the day that Monday mysteriously disappears ...