1990, a bleary-eyed detective stepped into a townhouse in a suburb of Chicago, Illinois. The detective had been on call for days, and all he wanted to do was sleep. But now, he’d been called in to investigate a double homicide. The detective opened the door to the basement, and started walking down the steps. The overhead light cast shadows on the floor below, so he couldn’t get a clear look at what he was walking into. Then the detective reached the bottom of the steps, and he suddenly felt wide awake. The scene in the basement was far more gruesome than he’d imagined – two dead bodies lay there on the floor. And there was one thing that jumped out at the detective immediately. On a cardboard box sitting between the bodies, a heart and the letter “U” was scrawled in blood. The detective had no idea if one of the victims had left the message, or if this was a scene staged by a deranged killer… and it would take him six months to get the answer he was looking for… and to discover what really happened in that basement