In Louisville, a 33-year-old woman collapses in the street after being stabbed multiple times. When detectives arrive at the crime scene there's a startling discovery--they're familiar with the victim. Now, Sgt. Brian Nunn and Det. Brenda Wescott must reach out to witnesses and friends of the victim to track down her killer. And in Minneapolis, Sgts. Jerry Wallerich and Gerhard Wehr investigate the murder of a 19-year-old college student, shot down on a residential street. With little to go on, the case is at a stand still until investigators get an important piece of information--the victim spoke with his sister as he was dying. But will the victim's last words help identify his killer?