There are 3 books in the Book of the Ancestor series. The newest book is Holy Sister which came out in 2019.

1
Red Sister

Book cover of Red Sister

It's not until you're broken that you find your sharpest edge.

"I was born for killing - the gods made me to ruin."

At the Convent of Sweet Mercy young girls are raised to be killers. In a few the old bloods show, gifting talents rarely seen since the tribes…

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2
Grey Sister

Book cover of Grey Sister

Second novel in the brilliant new series from the bestselling author of Prince of Thorns.

In Mystic Class Nona Grey begins to learn the secrets of the universe. But so often, knowing the truth just makes our choices harder. Before she leaves the Convent of Sweet Mercy, Nona must choose…

3
Holy Sister

Book cover of Holy Sister

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…