Michael Dahl, the author of the Library of Doom and Troll Hunters series, is an expert on fear. He is afraid of heights (but he still flies). He is afraid of small, enclosed spaces (but his house is crammed with over 3,000 books). He is afraid of ghosts (but that same house is haunted). He hopes that by writing about fear, he will eventually be able to overcome his own. So far it is not working. But he is afraid to stop. He claims that, if he had to, he would travel to Mount Doom in order to toss in a dangerous piece of jewelry. Even though he is afraid of volcanoes. And jewelry.