In Miami, Sgt. Louis Melancon and Det. Carlos Castellanos investigate the murder of two men savagely gunned down in the middle of a residential street. Detectives learn that a roommate of the two victim's is missing. Now they need to track him down to find out what he knows about the murders. And in Cincinnati, Det. Hilbert and his team search for the suspect in a shooting that left one man dead and another wounded. Detectives hope the wounded man will be able to identify their shooter.