“What Happened to Monday” is a 2017 dystopian sci‑fi thriller where seven identical sisters, all played by Noomi Rapace, live under a brutal one‑child policy and secretly share a single public identity.

What the movie is about

In an overpopulated future, the Child Allocation Bureau (C.A.B.), led by politician Nicolette Cayman, enforces a strict one‑child law: extra children are supposedly put into “cryosleep” for a better future.

A man named Terrence Settman raises his seven granddaughters in hiding and names them after the days of the week—Monday through Sunday—teaching them to act as one person in public: “Karen Settman.”

Each sister can go outside only on her own day (Monday goes out Monday, Tuesday on Tuesday, etc.), and they must perfectly share memories so no one realizes “Karen” is actually seven people.

What actually happens to Monday (no‑spoiler vs spoiler)

Non‑spoiler version:
One day, Monday does not come home after her outing as “Karen,” and the rest of the week‑named sisters try to figure out what happened to her while the regime closes in.

Heavier spoilers ahead:

  • The authorities capture Tuesday and use her severed eye to raid the sisters’ apartment, killing Sunday and later other siblings as the story escalates.
  • The surviving sisters discover that Monday secretly cut a deal with Cayman: she revealed her sisters’ existence, funded Cayman’s political campaign, and tried to eliminate them so she alone could live as “Karen.”
  • Monday is also pregnant with twins, and her betrayal is driven by desperation to protect her children in a world that outlaws siblings.

In the climax, Thursday confronts Monday; Monday is shot during a fundraiser after stumbling out with a gun and dies in Thursday’s arms, asking her to protect the unborn twins.

Ending and aftermath

  • Thursday and Adrian (Monday’s lover, who didn’t realize she had identical sisters) infiltrate C.A.B. headquarters and record proof that surplus children are burned, not preserved in cryosleep.
  • They broadcast the footage during Cayman’s campaign event, causing public outrage.
  • The Child Allocation Act is abolished, and Cayman faces the death penalty for her part in the killings.
  • Tuesday, Thursday, and Adrian survive and watch Monday’s twins grow in an artificial womb, now in a world where siblings can exist openly.

Themes, reception, and why people still talk about it

  • Themes: Overpopulation, state control over reproduction, identity, sacrifice, and the moral cost of survival all run through the story.
  • Performance hook: Viewers often praise Noomi Rapace’s seven distinct performances as the main reason to watch.
  • Reception: Many reviews call the concept strong and entertaining but say the plot has holes and a somewhat messy third act, while still recommending it for its tension and central performance.
  • Forum chatter: On movie forums and Reddit, people describe it as a cool concept with a heavy emotional aftertaste and compare it to other dark sci‑fi like “The Platform.”

TL;DR

“What Happened to Monday” is about seven hidden sisters sharing one identity under a one‑child regime; Monday betrays the others to protect her unborn twins, dies in the finale, and her surviving sisters expose the regime and raise her children in a freer world.

Information gathered from public forums or data available on the internet and portrayed here.