Later, agent Grady asks Ziva where McGee is. She tells her that he missed his polygraph meeting.

Tony and McGee go to the funeral home. The director says that even though their mortician did a great job on Arnet, the family decided to have a closed casket. Tony asks if there is a security system. McGee gets a text from Ziva who informs him that he missed his polygraph appointment. Tony asks McGee to hop in the casket so they can take a photo and send to the polygraph division so they would think he was dead. The director comes back and says that she got a security alarm alert the day of Arnet's funeral. The team figures that it was enough time to steal the body.

Abby looks at the weights and tells Ducky that they were cleaned before they were placed in the casket. The team wonders if Matt stole Arnet's body in order to perpetuate the idea of a cover up. McGee says that he wants to examine Matt's car. Tony and McGee go to the Metro car impound yard and spot Matt's car. They see a camera which McGee covers up using a mayo pellet launched from a paint ball gun. McGee worries about dogs, but Tony assures him because of budget cuts, they probably don't have any. They climb the fence and break into Matt's car. Tony scares McGee by playing the sound of dogs barking on his phone. McGee downloads the GPS history just before real dogs chase after them. They run and evade the dogs by running on top of cars. A police offer catches them just before they climb over the fence. Tony and McGee are arrested.

Back at the lab, Abby tells Gibbs that Matt was parked in front of the mortuary the day of Arnet's funeral. Tony and McGee return to work. Meanwhile, Ziva looks around and sees that she is alone. She starts to compose a letter to her father, but stops when Abby arrives. She tells her that they used Matt's GPS record and found where he buried Arnet's body. Abby asks her to go out to celebrate, but Ziva says that she has something to do first. After Abby leaves, she resumes her letter.

McGee goes to polygraph room and is strapped to the machine. Agent Grady says that she came in early for him. She says that she takes a train and rides with the same people. She gets close and causes his blood pressure to rise. She proceeds to ask him questions about his record. She asks if he is in a committed relationship and he says no. McGee thinks about the case and asks Grady to reschedule their appointment.

McGee asks Abby if Arnet had a rail pass and she says yes. They learn that Arnet and Sutter rode the same train together to work. They figure that Arnet and Sutter met and became friends on the train. Tony and McGee meet with Sutter and ask him about Hitchcock's Strangers on a Train. They tell him that they know he worked with Arnet to split the insider trading earnings. They figure that after Arnet died, Sutter suspected that Matt had evidence to link him to the insider trading. The agents suspect that Sutter set Matt up to meet him to provide him with information, but instead, killed him.

Later, Sportelli is called in to headquarters to take Sutter to jail. Gibbs tells McGee that he made an impression with Agent Grady. Ziva hands Gibbs a paper and asks him to sign it so she can be a full time NCIS agent. Gibbs says that she has to resign from the Mossad. She says that she already did. Gibbs is about to sign the recommendation, but takes a moment to think about it.