Sally Jensen was NASA's lead astronaut until the Mars mission ended in disaster under her leadership. Government space programs have closed. Haunted by thoughts of failure, she lives convinced that her days in space are over. Jensen is wrong. A large alien object has entered the solar system and is heading directly towards Earth. He does not respond to attempts to get in touch. Running out of time and resources, NASA turns to Sally Jensen. A new mission has begun. But as the facility reveals its secrets, Jensen and her team find themselves embroiled in a desperate fight for survival against the cold vacuum of space and something much, much worse...