Welcome to the extraordinary world of undercover animals! 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, dog-nappers, and an extraordinary group of animal spies!

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