A solitary man, intent on inflicting a major catastrophe on the United States in retaliation for the death of his wife and two children in a US bombing raid on his mideastern city of residence, has arrived in Canada surreptitiously on a small fishing boat. With the help of a Quebec Islamic militant group, he plans to cross the border into Vermont and hike the Appalachian Trail to New York. Jon Richards, a Homeland Security agent, has picked up hints from a myriad of web conversations between militant jihadist groups that a terrorist might have made it to the North American Continent. His...