Ottilie Colter is the first girl ever to join the secretive, boys-only Narroway Hunt -- and with her trusty wingerslink by her side she's determined that she won't be the last. The Hunt trains boys to fight ruthless monsters known as dredretches, but now it's under threat. Dredretches have invaded Fort Fiory, and no-one is safe -- especially not the girls who live there, but aren't allowed to fight. Ottilie must convince the Hunt to train the girls -- but with the dredretches getting worse, talk of witchcraft on the rise, and a mysterious hooded figure in the Narroway itself, her time is running out...