Artemis Rex. Ultra Meridian, #2

Powerful forces are amassing from every corner of the galaxy and they all want the doomsday weapon Sheriff Mace Davenport is carrying. The ultimate battle for the fate of humanity spills over into the unknown reaches of Sacron Enigma, the vast stretch of space beyond which only the foolhardy dare to tread. Davenport and his friends have already lost everything that matters. They have only each other and the mission they've all sworn to carry-to keep the weapon away from Admiral Killian Joyce, the madman who will stop at nothing to get it back. Admiral Joyce is about to learn that he isn't the only psychopathic murderer in the Confederacy and beyond it.
They're as determined as Joyce to steal the weapon and they won't let him stand in their way. The final confrontation will leave the world in ruins unless Davenport's crew can find a way to stop it without getting their heads blown off in the process.