As Tony and Ziva escort a witness home from Paris, their assignment takes a very serious turn when they discover a hired assassin is targeting the very witness they're protecting while back in D.C, Gibbs and McGee investigate the death of a Marine and in the process, discover some unsettling secrets about the victim.
In a small apartment complex, maid Lupe arrives for work and after closing the door and locking it, turns around to see the apartment is a complete mess with various items all over the floor.
She mutters something in Spanish and says to herself, "Mr. Parsons, this is going to cost you extra".
With that, Lupe begins cleaning.
She picks up two shoes from the floor but stops upon hearing some clattering.
"Hello?", Lupe calls.
She then peeks through an open door and calls Parsons's name.
As she steps into the bathroom, a black cat meowing loudly emerges, causing Lupe to swear in Spanish and angrily wonder what the cat is doing in there?
She then realizes that the shower curtain has been pulled across the shower itself.
Lupe then approaches and pulls it, revealing that Sergeant Mark Parsons sitting semi-upright in the shower, the body almost completely buried in kitty litter.
"Mr. Parsons?", Lupe wonders, stunned before she blesses herself.
It then cuts to Parsons who sits there, dead, three scratches on his face.
In the bullpen, McGee talks about Sergeant Mark Parsons while revealing that members of his Special Op team said that he was a good Marine but a loner with no family and no friends and apparently, the Marine-turned-hitman really kept to himself.
"The nature of the business", Gibbs remarks.
- Holly Snow, an influential Washington, DC madam and brothelkeeper is introduced for the first time.
- In the process of arresting Nora Williams's fiance, Gibbs's right arm is broken, resulting in him being forced to use his left arm.
|Leroy Jethro Gibbs||Mark Harmon||Special Agent in charge of the NCIS Major Case Response Team.|
|Anthony DiNozzo||Michael Weatherly||Senior Agent and second-in-command of the NCIS Major Case Response Team.|
|Ziva David||Cote de Pablo||NCIS Probationary Agent and also a member of the NCIS Major Case Response Team.|
|Timothy McGee||Sean Murray (actor)||Junior Special Agent of the NCIS Major Case Response Team.|
|Abigail Sciuto||Pauley Perrette||Chief Forensic Specialist of the NCIS Major Case Response Team.|
|Leon Vance||Rocky Carroll||Director of NCIS.|
|Donald Mallard||David McCallum||Chief Medical Examiner of the NCIS Major Case Response Team.|
|Nora Williams||Lily Rains||Federal witness under Tony and Ziva's protection.|
|Holly Snow||Dina Meyer||Madam and brothelkeeper.|
|Ray Beringer||Ryan Cutrona||Nora Williams's boss who is under federal indictment for racketeering, fraud, and embezzlement.|
|Tiffany Chase||Victoria Pratt||Flight Attendant and contract killer. Attempted to kill Nora but Ziva and Tony stopped her before arresting her.|
|Daniel Sturgis||David de Lautour||Nora Williams's fiancé who also hired Tiffany Chase, the contact killer to murder Nora as her statement would expose him as well as it was revealed that he had stolen from Ray Beringer. Is later arrested by Gibbs and McGee.|
|Art Neely||Kevin Symons||Federal Air Marshal. Tiffany Chase killed him during the flight by sticking a needle into his neck. It should be noted that the Internet Movie Database has his name as Mark Neely instead of Art.|
|Lupe||Livia Treviño||A woman who appears in the episode.|
|Steven Baker||Darren Keefe Reiher||A man who appears in the episode.|
|Stephan||Clark Koelsch||Flight Attendant.|