In the city of Guelma, which was once called Heliopolis in ancient times, the daily life of an Algerian family takes its usual course. But on May 8, 1945, the day the end of World War II was announced, demonstrations by the Algerian people against the French colonial power and for the country's independence took place, which were bloodily suppressed by the French army and French settler militias. The event went down in history as the Sétif and Guelma massacre.
Jean-Pierre is a brilliant surgeon. The problems of his nearest and dearest don't interest him. But when he discovers that he too has a serious heart disease which needs operating on, Jean-Pierre finds out what it is to be a patient.
Quando a inocente jovem Lucy (Scarlett Johansson) aceita transportar drogas dentro do seu estômago, ela não conhece muito bem os riscos que corre. Por acaso, ela acaba absorvendo as drogas, e um efeito inesperado acontece: Lucy ganha poderes sobre-humanos, incluindo a telecinesia, a ausência de dor e a capacidade de adquirir conhecimento instantaneamente.