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.

Zhenya and Boris are going through a vicious divorce marked by resentment, frustration and recriminations. Already embarking on new lives, each with a new partner, they are impatient to start again, to turn the page – even if it means threatening to abandon their 12-year-old son Alyosha. Until, after witnessing one of their fights, Alyosha disappears…