1977 A small town is shaken by a series of murders committed by the mysterious "Lady Killer". Beth Greer - young, rich, eccentric - becomes the ideal suspect: she was seen running away from the scene of one of the crimes. However, the court acquits her, and since then she has hardly left her mansion. 2017 Shay Collins devotes all her free time to a website with the intriguing name "The Book of Unsolved Cases," collecting information about crimes for which no one was punished. Having met Beth Greer by chance, Shay gets the idea to interview her, and, oddly enough, she agrees. The temptation to find out the truth about one of the most unusual cases is too great, although Shay gets goosebumps every time she crosses the threshold of a gloomy, inhospitable house in which time has frozen. What if smart, charming Beth is actually a cold-blooded, manipulative killer? What if there are other dangers lurking in the darkness that shrouds her spooky mansion?