Cross fire

When the peaceful alien-run government decides to simply withdraw from Earth, it seems that the terrorist group Sapience is going to get the "free" Earth it wanted; but Donovan Reyes, member of the security forces, and once a prisoner of Sapience, realizes that freedom comes with a price--other alien races want to strip the planet of its resources, and if anyone is going to survive, what is left of the security forces and Sapience have to work together.