The third book in a cosy and chaotic illustrated animal series following the adventures of a postmouse by an award-winning and bestselling author-illustrator.

Marty Moose is off on his merry rounds as the postmouse of Little Ditch, when he finds that no one will accept his letters! Animals all over town have been receiving very strange post from a mysterious sender, and if Marty wants to keep up a good job, he - with the "help" of his friend Nibbles - has got to solve the case.

Can he sniff out the sneaky secret sender, or will his whiskers lead him down the wrong burrow?

Read all the Adventures of a Postmouse in:

Marty Moose: First Class Mischief
Marty Moose: The Great Stamp-ede
Marty Moose: Secret Sender Mystery

Perfect for fans of Grimwood, Badgers are Go, Murray and Bun and Adventuremice!