 Brenda and her team investigate the death of a well-known psychiatrist who was killed in his office. The victim was one of several doctors treating young adults addicts and was running a clinical test of a new anti-depressant that was meant to keep them from returning to illicit drug use. Turns out the drug may have had serious side effects but the leader of the study is less than cooperative. The case takes an interesting turn when it turns out the drug may not have anything to do with the murder. Meanwhile, Lt. Flynn, who is still trying to undermine Brenda s authority, learns that Brenda was the subject of an ethics investigation while with the Atlanta PD.