After his mother's death, sixteen year old Seth Bradley chooses to leave behind his friends, his school, and his entire life within the rusted, broken down space station Ticonderoga. With his sister Jenna in tow, he sets out to join a father he barely knows in the orbital city of Grass Valley, a monument to human achievement floating three hundred miles above the Earth.
Ava Morales is a girl with a mysterious and violent past. The soldiers of the Democratic Republic of Mars sing praises to her name, but to her family she is a terrible secret.
When Grass Valley is caught in the crossfire of an all-out war between Earth and Mars, Seth, Jenna and Anne must work together to survive as they find themselves trapped in a world that is literally crumbling around them.