1992, a young mother received a package in the mail that had no return address on it. When she brought it inside her house and opened it up, she found it contained a non-fiction murder mystery novel. She didn't know why it had been sent to her, but when she opened the novel up, she noticed someone had gone through and underlined several sections. At first, she assumed this novel must just be second hand copy and so the previous owner's notes were still inside. But when she actually read some of the highlighted sections, she immediately understood that someone was sending her a terrifying message... But this would only be the start