An extremely evil book marked with an X has unleashed a swarm of X-winged insects, and the bugs are on the hunt for their favorite food—books! When the hungry horde targets a bookmobile and the humans inside, can the expert Librarian force the deadly pests to exit? Or will they turn him into an ex-librarian? Uncover hidden dangers and dark mysteries with SECRETS OF THE LIBRARY OF DOOM, a page-turning chapter book series from bestselling author Michael Dahl.