After her separation, Heidi Widmer packed up her life in Buffalo and moved to Los Angeles, looking for a fresh start. The eighth-grade teacher spent seven days of solitude on the road with her dog. She pulled into Culver City in July.Her first night in the new apartment was rough. Something above her kept making a heavy rolling sound across the floor. Annoyed, stressed and running on no sleep after the long drive, Heidi filmed her ceiling to capture how loud the noise was. She never sent the video to anyone. Weeks later, she found out what the sound was.