Seer of Souls Book One of the Spirit Shield Saga

Twins Cayden and Avery Tiernan have grown up in isolation. Gifted with forbidden skills, they hide their growing powers while Queen Alcina hunts them. Guided by her gift, Avery senses lies and treachery where others see only truth. For Cayden, an irresistible voice whispers to him. Does it belong to the souls of the dead?