Calla North and her mum Elizabeth live a life that's far from normal. There are days when the power is cut off and Calla has to do her homework by candlelight; there are others when curious strangers want to talk to Elizabeth about her research on ducks.

When Elizabeth says yes to a once-in-a-lifetime trip to save a small brown duck, she sends Calla to the best place she knows: The School of the Good Sisters. Staffed by nuns whose preferred subjects include light aircraft maintenance, camouflage skills, and cake - lots of cake - Calla is about to discover her bravery, and to learn that when trouble comes, there's no better back-up than a Blessing of Nuns...

Auteur

Daisy May Johnson is a writer, researcher, chartered librarian and former A14 Writer in Residence with the University of Cambridge. She blogs about children's literature at Did You Ever Stop To Think, tweets as @chaletfan, and even sends the occasional Tiny Letter. When she's not doing any of that, you'll find her curled up with her favourite school stories, or baking the world's best chocolate brownies.