The Crescent Rule : 9781463418564 : 28 Jun 2011 : The Crescent Rule is a book about a young man growing up in a small town who becomes intrigued by a secluded religious community and a train whistle that eminates from their compund. As time progresses, this young man becomes an agent for the government and discovers a hidden society based in Europe that has secretly controled world governments for over 300 years. Toby stumbles on the fact that the train whistles he heard as a boy were a call to meetings for the Crescent Rule members right there in his small hometown.