One day, Will and Lucy's dad just ... vanishes. They have no idea why he's disappeared until a creepy stranger reveals their dad was keeping a BIG secret. Then there's the second clue: an old diary they find hidden in the walls of their Royal Mile house, with a sinister black dagger on it. Will and Lucy must solve a mystery that's over two hundred years old if they want to find their dad and bring him home. But can they find the answers in time to rescue him?

 

This book is part of a book series called Kelpies .

This book has been graded for interest at 8-12 years.

There are 208 pages in this book. This book was published 2014 by Floris Books .

Joan Lingard was born in Edinburgh but grew up in Belfast. She has had a long and varied career in children's books, and was awarded the M. B. E, in 1998 for services to children's literature. She writes with equal success for teenagers, adults and the very young.