Don't question your Guardians. Don't keep secrets. Don't venture near the Wall.Saskia has spent her life blindly following the Twelve Cardinal Rules laid out for her by the Guardians, just like every other citizen of Xantera - even when they demand a living sacrifice to protect the city from the Monster who prowls beyond the Wall.But when Saskia finds a strange pendant left behind by a mysterious stranger, she begins to hear a voice in her head that could change everything. Deadly, coercive and magnetic, Saskia finds herself beholden to the voice of a man she has never met, but has been taught to fear.The Monster outside has ignited Saskia's heart - and he wants her to let him in...