Los Angeles can be a dangerous city - never more so than in the dead of night. Detective Renée Ballard, once one of the department's young hotshots, now works 'The Late Show', the notorious graveyard shift at the LAPD.

It's a thankless job keeping strange hours in a twilight world of tragedy and violence, handing over her investigations as the sun rises, never getting closure.

Some nights are worse than others. And tonight is the worst yet. Two cases: a brutal assault, and a multiple murder with no suspect.

Ballard knows it is always darkest before dawn. But what she doesn't know is how deep her dual investigation will take her into the dark heart of her city, her department and her past...