Hidden, Chica de Luz

It was Jacinda's destiny to bond with Cassian, but she fell in love with a human hunter named Will instead. When she runs away with him, her sister Miriam is taken prisoner. Consumed by guilt, she will stop at nothing to free her sister, even if it means venturing deep into enemy territory. Even with help, there are no assurances that she (or anyone) will make it out alive.