As Yoyo and Doc Croc begin another adventure they meet a boy who's so tiny that he's only the size of a thumb! It seems Tom Thumb isn't very happy because all the other boys keep laughing at him. Yoyo and Doc Croc join him and together they set out to have some fun and lots of adventures. Along the way they meet two nasty men, a maid, a cow and a friendly mouse! Will Tom Thumb be able to escape from the nasty men and why is the maid angry?
This book accompanies the enchanting and hugely successful animated television series 'Simsala Grimm'.