Dr. Megan Hunt was in a class of her own, a brilliant neurosurgeon at the top of her game. But her world is turned upside down when a devastating car accident puts an end to her time in the operating room. Megan resumes her career as a medical examiner, determined to solve the puzzle of who or what killed the victims.

Deputy Police Chief Brenda Leigh Johnson transfers from Atlanta to LA to head up a special unit of the LAPD that handles sensitive, high-profile murder cases. Johnson's quirky personality and hard-nosed approach often rubs her colleagues the wrong way, but her reputation as one of the world's best interrogator eventually wins over even her toughest critics.