Three months after surviving a terrorist attack in a bistro, Mia is still traumatized and unable to recall the events of that night. In an effort to move forward, she investigates her memories and retraces her steps.
Sarah is a French astronaut training at the European Space Agency in Cologne. She is the only woman in the arduous program. She lives alone with Stella, her seven year old daughter. Sarah feels guilty that she cannot spend more time with her child. Her love is overpowering, unsettling. When Sarah is chosen to join the crew of a year-long space mission called Proxima, it creates chaos in the mother-daughter relationship.