Survival comes at a steep cost... when you're being chased down a magical staircase by shape shifting mythological creatures that want to kill you. With Styx gone, Anna's only ally against the ancient powers is Cax, a charming thief she can't seem to fully trust... or trust herself with. Each spiraling step towards her ultimate destiny as The Heir leads to shocking revelations about Cax, the darkly fantastical Libraries, and the mysterious voice within...