Bluebeard and the Outlaw by Tara Grayce

Marriage: the ultimate heist.

Robin of the Greenwood spends her days robbing from the rich to feed the poor. With her knowledge of the fae paths, she eludes all attempts to capture her. But she and her merry band of brothers never seem to get anywhere. The more she steals, the more the evil Duke Guy “Bluebeard” taxes the villagers.
When Robin discovers that Duke Guy plans to marry yet again, she conceives a plan for a final, big score. As Guy’s wife, she will have access to his wealth. The lord is notorious for killing his wives shortly after he marries them, but Robin has no plans to be dead wife number four.
The only problem is that Duke Guy is devastatingly handsome, brooding, and nothing at all what she expected. If she isn’t careful, she might just find that he steals her heart before she can rob his riches.