When Janice and Tommy Brooks are invited to visit their Aunt Annabelle and her son Hubert at their new house in Maine near the Canadian border, they expect to have a wonderful summer. What they don't expect is to hear galloping hoofbeats in a rock or to see an old man with a flickering light appear out of nowhere in the middle of a midnight storm. They don't expect to have a guest who creeps around the top floor when he thinks the family is asleep. And they never dream that they might get involved in the dangerous adventures of the Border Patrol

These puzzling and frightening...