Invisible Ink — Michael Dahl

The Eraser, sworn enemy of the Library of Doom, has come up with a wicked new scheme. He's created a powerful gas that will turn ink invisible and render all books empty and useless. Will the Librarian be able to stop the villain's criminal concoction? Uncover hidden dangers and dark mysteries with SECRETS OF THE LIBRARY OF DOOM, a page-turning chapter book series from bestselling author Michael Dahl.