The darkness before them / Matthew Ward.

"These are dark times for the Kingdom of Khalad. As the magical mists of the Veil devour the land, the populace struggles beneath the rule of ruthless noble houses and their uncaring immortal king. Kat doesn't care about any of that. A talented thief, she's pursuing one big score that will settle the debt that destroyed her family. No easy feat in a realm where indentured spirits hold vigil over every vault and treasure room. However, Kat has a unique gift: she can speak to those spirits, and even command them. She'll need every advantage she can get. Kat's not a hero. She just wants to be free. To have her old life back. But as rebellion rekindles and the war for Khalad's future begins, everyone - Kat included - will have to pick a side"--