A Petty Officer is gunned down while talking to his wife but when Tony and Ziva inform the victim's C.O of the death, they discover that another man is posing as the victim. This leads the team into a possible case of mistaken identity, only to find that the victim left them a message before he died about who killed him.
The scene opens with Petty Officer Jerry Smith driving down a long stretch of road while talking to his wife. The two are engaged in a conversation that quickly turns into an argument and it's all concerning their anniversary. Smith then starts ignoring his wife who's still rambling and raving about her husband, calling him a bastard.
Suddenly, Smith sees something that causes him to attempt to duck for cover but the unknown assassin soon shoots him, causing a splatter of blood to appear on the window. Smith then collapses over the steering wheel, dead. As this goes on, his wife still calls her husband, unaware of what's happened.
The car then drives off a cliff and for a second, there's nothing but smoke.
It then cuts to Smith who's now shown to be lying underneath the car, dead, his lifeless eyes still open and there's a bullet wound in the left side of his neck.
Gibbs reveals that he has about 50 different Rules and that it's his job to teach them to the rest of his team.
It's revealed that the real Petty Officer Jerry Smith was killed by his wife, Wendy Smith because he'd been cheating on her since their wedding day.
It's soon discovered that John Kirby had been posing as the victim for a few months so that the real Smith would avoid getting a dishonorable discharge.
Abby and Ziva begin forming a possible friendship when they start reassembling the briefcase that the bomb squad blew up.
In the evidence garage, while she's saying "Very good, Gibbs", Abby's spider web tattoo is seen on the wrong side of her neck before swapping back to its normal side in the next shot.
Someone appears to be using McGee's credit card to buy porno, although it's not revealed who it was.