Her Sister's Keepers (Hadra Series)

Nhazul, a restless young Hadra from Ossen, travels to the forbidden Shokarn city of Nhor. There she becomes embroiled in a daring and dangerous raid on the 'Gray Place', a huge cave under the city where Weavers are imprisoned for life. When the Hadra are blamed for the raid, Nhazul is forced to stand trial for her actions.