Download or read book The Secret Invention written by Thea Stilton and published by . This book was released on 2018-08-28 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The students of Mouseford Academy are participating in an enormouse science fair! Mice from schools around the world are all hoping to take the top prize. The Thea Sisters would love to win, but so would Ruby Flashyfur - and shes willing to do whatev