Among Thieves by MJ Kuhn 

In just over a year’s time, Ryia Cautella has already earned herself a reputation as the quickest, deadliest blade in the dockside city of Carrowwick—not to mention the sharpest tongue. But Ryia Cautella is not her real name. For the past six years, a deadly secret has kept her in hiding, running from town to town, doing whatever it takes to stay one step ahead of the formidable Guildmaster—the sovereign ruler of the five kingdoms of Thamorr. No matter how far or fast she travels, his servants never fail to track her…. Read more.