There is only one person who can help her - her ex-husband Stephen, a NASA scientist who was heading up the mission back on Earth. Until, that is, she broke his heart and he left both her and the mission.
Now May clings to life and it is only his voice travelling across the fathomless miles that can bring her home.
In this twisty, gasp-inducing thriller, when each breath is a fight for survival, their relationship is the difference between life and death.
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