When a young, interracial couple is found shot and killed inside their car in Fairmount Park, Dr. Hunt promises the grieving parents that their daughter's killer will be found. Detectives Morris and Baker are ready to chalk the case up to a murder-suicide, but Megan and her team find evidence on the bodies that sends the case in an entirely different and shocking direction. Meanwhile, Peter advises Megan not to push too hard when it comes to reconnecting with her daughter, Lacey.