For 'Frank, ' L.A.P.D. Homicide Lieutenant L.A. Franco and her homicide squad, it's business as usual -- a multiple murder, ugly as it is, at least seems to have an easy explanation. Until it coincides with an untimely drive-by shooting.

The investigation ultimately pulls Frank and her squad in conflicting directions while drawing Frank closer to the county's new Chief Coroner, Gail Lawless. Through a series of twists and turns, all Frank's leads eventually bring her to the disquieting possibility that the killer she seeks might well be one of her own brothers in blue.