Silver in the bone

"Tamsin Lark goes on a quest to find the infamous ring from Arthurian legend to break her brother's curse"-- Tamsin Lark didn't ask to be a Hollower. As a mortal with no magical talent, she was never meant to break into ancient crypts, or compete with sorceresses and Cunningfolk for the treasures inside. But after her thieving foster father disappeared without so much as a goodbye, it was the only way to keep herself--and her brother, Cabell--alive....