The Shattered Sphere (Hunted Earth, Book 2)

Humans face two enemies--the implacably powerful Charonians who kidnapped the Earth, and the mysterious Adversary, before whom the Charonians quake in fear. Can an unlikely combination of scientists, corpses, dictators, and professional troublemakers withstand both threats and return the Earth to its proper place in the Solar System? The sequel to The Ring of Charon.