Shadowheart (Shadowmarch Series #4)

"When it comes to inventing new worlds, he's as skilled as J.R.R. Tolkien and Frank Herbert." -Christopher Paolini, bestselling author of Eragon.

Southmarch Castle is about to be caught between two implacable enemies, the ancient, immortal Qar and the insane god-king, the Autarch of Xis. Meanwhile, its two young defenders, Princess Briony and Prince Barrick, are both trapped far away from home and fighting for their lives.

And now, something is awakening underneath …