The Sea Without a Shore — David Drake

Cinnabar's chief spymaster is a mother also--and her son is determined to search for treasure in the midst of a civil war. Who better to hold the boy's hand -- and to take the blows directed at him -- than Captain Daniel Leary, the Republic of Cinnabar Navy's troubleshooter, and his friend the cyberspy Adele Mundy?

The only thing certain in the struggle for control of the mining planet Corcyra is that the rival parties are more dangerous to their own allies than to their opponents. Daniel and Adele face kidnappers, hijackers, pirates and a death squad -- even before they can get to their real business of ending the war on Corcyra. Only with planetary peace can the boy they're escorting get on with his mission.

The boy thinks the treasure he's looking for is a thousand years old. Daniel and Adele know that it's probably a dream --

But if the treasure is real, it just might be tens of thousands of years older than anyone imagines, and incalculably more valuable!