Detective Renée Ballard works 'The Late Show', the notorious graveyard shift at the LAPD. It's thankless work for a once-promising detective, keeping strange hours in a twilight world of crime. Some nights are worse than others. And tonight is the worst yet. Two shocking cases, hours apart: a brutal assault, and a multiple murder with no suspects. Ballard knows it is always darkest before dawn. But what she doesn't know - yet - is how deep her investigation will take her into the dark heart of her city, the police department and her own past...