“13 Graves” (** out of four) was an elegant but empty horror melodrama about two mob contract killers (Kevin Leslie and Morgan James) who attempt to dispose of their latest victim in a graveyard but soon realize they are being stalked by a malevent force and (yawn) paranormal activity and they realize they have to fight together if they want to make it out alive. Good production values and filmmaking for this kind of horror trifle but story never becomes involving. Attempt to cross-pollinate an “Exorcist”-like horror story with British comic gangster dramas like “Snatch” works only in parts.