Mickey is the type of kid who's always on the lookout for a code to crack.

So it's her lucky day when she spots a strange poster on the bus home from school written completely in code.

Within the strange jumble of letters is a curious message, one that leads to an exciting adventure-with diamond thieves, dognappers, and an extraordinary group of animal spies!

This book contains real coded messages, can you crack the codes before Mickey does?