The only viable option for long term habitation lies beneath the surface of the planet, where humans can be shielded from harsh cosmic radiation.

Connor, Harrison, and Liz are senior members of the US module. When war breaks out on Earth, and rumours begin spreading on Mars, they find their core principles rocked by the devastation and loss of friends and family. Who can you trust on an international mission when your countries are at war? As the colonists struggle to figure out what really happened on Earth, grief and anger become pitted against camaraderie and the spirit of exploration.