Westfield New Jersey, 2014. One of the 30 safest towns in America. The perfect place to hide. Derek and Maria Broaddus just bought their dream home. Six bedrooms, four fireplaces, 1.3 million dollars. But three days after closing, a letter arrived in [music] the mailbox addressed to the new owner. It was the first [music] of many. My grandfather watched the house in the 1920s. My father watched in the 1960s. It is now my time. Do you need to fill the house [music] with the young blood I requested? 657 Boulevard is my obsession. Investigators [music] analyzed DNA and handwriting. The sender was a woman, but no match was ever found. [music] Nobody identified the watcher. In 2019, they sold for a massive loss. The new owners moved in, but they have never received a single [music] letter. But there is a twist. During the ordeal, Derek Broaddus was caught sending anonymous letters to his own neighbors. The case remains open. The house is occupied. No letters since 2019. >> [music] >> Follow for more of the full story.