An unidentified object collides with the International Space Station leading to the death of one of the five astronauts aboard and crippling most of the onboard systems and one of the Soyuz descent modules. Three of the surviving astronauts make an emergency evacuation in the functional Soyuz module leaving behind Swedish astronaut Johanna "Jo" Ericsson of the European Space Agency to repair the other Soyuz. When she returns to Earth with the body of her dead crewmate she finds that parts of her life are missing or not as she remembers them.