A Dangerous Warning
This guy and a group of companions took up residence in abandoned buildings. One location was known as a dealer’s den, but it had been months since anybody had conducted business there. They assumed it was safe enough to sleep for a while, making that mistake.
They heard knocking on the front door the first night, but they ignored it. The following day, when they investigated, they found a massive knife on the front door, as if someone had come by the previous night to harm them. The group didn’t stay for long.