Peterson also wrote a four-book series of fantasy/adventure novels for young adults entitled "The Wingfeather Saga" published by Waterbrook Press, a subsidiary of Random House and Rabbit Room Press. The first novel, "On the Edge of the Dark Sea of Darkness", was released March 18, 2008. The second novel in the series, "North! Or Be Eaten", winner of the 2009 Christie Award for Young Adult Fiction, was released August 18, 2009, and the third novel in the series, "The Monster in the Hollows", was released in May 2011. The series concluded with "The Warden and the Wolf King", and won the 2015 Clive Staples Award (named after C.S. Lewis) for Imaginative Fiction. This novel was funded successfully through Kickstarter in August 2013 and was released in July 2014.