There are 3 books in the The Narroway Trilogy series. The newest book is Ottilie Colter and the Withering World which came out in 2020.

1
Ottilie Colter and the Narroway Hunt

Book cover of Ottilie Colter and the Narroway Hunt

In the most thrilling fantasy of the year, a young girl must pretend to be a boy to rescue her brother from a secret order of monster hunters.

Ottilie Colter and her brother, Gully, have always fended for themselves. So when Gully goes missing one night, Ottilie sets out to…

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2
Ottilie Colter and the Master of Monsters

Book cover of Ottilie Colter and the Master of Monsters
A SECRET HUNT. A SECRET HERO.

Ottilie Colter is the first girl ever to join the secretive, boys-only Narroway Hunt - and she's determined that she won't be the last.

The Hunt trains children to kill ruthless monsters known as dredretches, but now it's under threat. Dredretches have invaded Fort…

3
Ottilie Colter and the Withering World

Book cover of Ottilie Colter and the Withering World
SLEEPER COMES FOR NONE

Ottilie and her friends are members of the Narroway Hunt, a secret organisation that trains children to kill bloodthirsty monsters called dredretches.

Now, the huntsmen are under attack - by something far worse than dredretches. A witch is cursing them one by one, making them unwilling…