Unconquerable Sun by Kate Elliott

'An entertaining shoot-'em-up, replete with epic starship battles, court intrigue and Machiavellian betrayals' Guardian

It has been eight centuries since the beacon system failed, sundering the heavens. Rising from the ashes of the collapse, cultures have fought, system-by-system, for control of the few remaining beacons. The Republic of Chaonia is one such polity. Surrounded by the Yele League and the vast Phene Empire, they have had to fight for their existence. After decades of conflict, Queen-Marshal Eirene has brought the Yele to heel.

Now it is time to deal with the Empire. Princess Sun, daughter and heir, has come of age.

In her first command, she drove a Phene garrison from the beacons of Na Iri - an impressive feat. But growing up in the shadow of her mother - a ruler both revered and feared - has been no easy task. While Sun may imagine that her victorious command will bring further opportunity to prove herself, it will in fact place her on the wrong side of court politics. There are those who would like to see Sun removed as heir, or better yet, dead. To survive, the princess must rely on her wits and companions: her biggest rival, her secret lover, and a dangerous prisoner of war.