Sally Jensen, the last astronaut to travel beyond our orbit, must build, train, and lead her team on the first mission to make first contact with an alien object.
It entered our solar system, slowed down off the rings of Saturn, and began a steady approach towards Earth.
Having forsaken manned missions the space programs of the world scramble to meet the visitor by enlisting forcefully-retired NASA legend Sally Jansen, the only person with the first-hand knowledge and operational experience capable of meeting this new visitor and finding out its purpose.
With no time to spare she must plan and execute a mission from scratch and lead a crew with no experience farther than mankind has ever travelled to make contact.
But each passing day brings it closer to home.