Planet 9

Sequel to Planet 9:

Earth is gone, but the danger didn't end with it.
A massive fragment of the shattered planet is already moving, on a direct course for Mars. Stranded on its surface, the survivors of Shuttle Eleven are cut off and running out of time.
Across the system, a desperate plan takes shape — one never attempted, on a scale no one is certain is even possible. And somewhere in the dark, Viper is already moving, patient and deliberate, thinking past everyone's next move.
The clock is ticking.
If they fail, Mars won’t just have witnessed Earth’s destruction. It will follow.