When the new homeowners arrived at their dream house, they were touched to find a welcome letter in the mailbox. It was such a thoughtful and old-fashioned custom for 2014. But what they read was terrifying and marked the beginning of a nightmare that lasted for years. "Allow me to welcome you to the neighborhood. My grandfather watched the house in the 1920s and my father watched in the 1960s. It is now my time. Do you know what lies within the walls? You have children. I have seen them. Once I know their names, I will call to them and draw them to me. Welcome my friends, welcome. Let the party begin.” It was signed The Watcher. Learn more about your ad choices. Visit podcastchoices.com/adchoices