The Berserker throne

"Prince Harivarman finds an ancient code that will either allow him to control an operable Berserker- one of the asteroid-sized, spacefaring war machines- or lead him to certain death."@en
"The Empress of the Eight Worlds has been assassinated. Prince Harivarman, exiled on the Templar Radiant, suspects that he will be the next victim. Help is scarce: Anne Blenheim, the fortress' clear-eyed, fair Commander, is favorably disposed toward the Prince, but her first responsibility is to the Templar High Command. And Chen Shizuoka, a Templar recruit sympathetic to Harivarman's cause, is being stalked by planetary security forces."@en
"Prince Harivarman has been exiled to Templar Radiant. There he discovers a Berserker and the code that will allow him to control the machine or lead everyone to certain death."@en