Sherlock helps Rhys, a former drug dealer, search for his kidnapped daughter; when Rhys suggests that Sherlock was a better detective when he was using drugs, Watson fears for his sobriety.
Alicia searches for answers as she tries to make sense of Will's death in the aftermath of the courthouse shooting. Meanwhile, Diane delivers the somber news to the partners at Lockhart/Gardner who must decide how to move forward. Matthew Goode guest stars.