For Children
* The Fairy Queen's Dilemma: A children's book about a fairy queen who must choose between two suitors.
* The Last Giant Quest: A children's book about a group of children who go on a quest to find the last giant.
* The Enchanted Wood: A children's book about a wood that is home to a variety of magical creatures.
For Adults
* The Day of the Dinosaur Lords: A novel about a group of people who are transported back in time to the age of the dinosaurs.
* The Age of the Titans: A novel about a group of people who are transported to a world where the Greek gods are real and there are many mythical monsters roaming the land.
In addition to his books, Shanahan has also written a number of short stories, essays, and articles. He is a regular contributor to a number of magazines and newspapers, including *The Globe and Mail*, *The Toronto Star*, and *The National Post*.