Nona Grey's story reaches its shattering conclusion in the third instalment of Book of the Ancestor. THEY CAME AGAINST HER AS A CHILD. NOW THEY FACE THE WOMAN. The ice is advancing; the Corridor narrowing; and the empire is under siege from the Scithrowl in the east and the Durns in the west. Everywhere; the emperor's armies are in retreat. Nona faces the final challenges that must be overcome if she is to become a full sister in the order of her choice. But it seems unlikely that Nona and her friends will have time to earn a nun's habit before war is on their doorstep. Even a warrior like Nona cannot hope to turn the tide of war. The shiphearts offer strength that she might use to protect those she loves; but it's a power that corrupts. A final battle is coming in which she will be torn between friends; unable to save them all. A battle in which her own demons will try to unmake her. A battle in which hearts will be broken; lovers lost; thrones burned. HOLY SISTER completes the Book of the Ancestor trilogy that began with RED SISTER and GREY SISTER. A ground-breaking series; it has established Mark Lawrence as one of the most exciting new voices in modern speculative fiction.