This is a high-energy tale of swashbuckling naval adventure, pirates, treasure, and swordplay.
Except it takes place in the far future, inside a giant balloon that's been sealed to cut out the outside world. Inside, there's very little gravity, so cities are built like wheels, and have to spin to create centripetal force. The ships float in the air, and are like baroque, steampunk airships, but there are also fast motorcycle-type vehicles that use the force of air to power them.
There is a central mechanical "sun"--a fusion reactor--called Candesce, and some smaller suns have popped up. Cities are built around these suns, and wars are fought over taking over resources and creating new suns.
Places where suns don't reach--the vast majority of the "planet"--are known as Winter. Winter is harsh.
It starts as a simple tale of revenge, but gets turned on its head by revelations and retrospect and the threat of war.
My biggest complaint is that the protagonist doesn't seem as interesting as any of the people he's surrounded by. He's Luke Skywalker in that way, I suppose.
I quite liked it, and I'm anxious to read the rest of the series.