Bureau of Mysteries combines jeopardy, narrow escapes, humour, plot twists and buckets of imagination in a rollicking ride that never seems to pause for breath. Highly recommended for ages 8 to 12 years.
David Witt, Sydney's Child
This book is a little like James Bond meets Oliver Twist. It has the added attraction of coded messages that need to be deciphered, allowing a genuine interaction with the story and exposing young readers to Morse, Cuckoo, Hex and Parrot codes (to name but a few).
Evie Marshall, Bookseller+Publisher
I’m such a sucker for a good mystery book, and this one was so much fun!
Harper's book is filled with wordplay, suspense and challenges for readers aged eight to 12.
Troy Lennon, Daily Telegraph