The Button (2010)

Pavlos his sister Eirini and his wife Iro live together a peaceful life but one ordinary day, a box with a button atop is mysteriously delivered to their apartment. That evening, a man who introduces himself as Mr. Londis visits. He gives Iro his offer to the box and explains that if she presses the button, someone she doesn't know will die, and she will receive one million euros. She has 24 hours to make a decision.