DiNozzo and Ziva visit a gas mask facility to which McGuire had delivered samples of the nerve gas. The pair encounters a strapping chief engineer that Ziva is smitten with, one Dane Hogan (Victor Webster). They question the man to confirm shipment details and determine that ten kilograms of the gas is missing. Tony gets a call from his love interest, Dr. Jeanne Benoit (Scottie Thompson), who breaks a date with him, and Ziva becomes more suspicious of DiNozzo and his relationship with physicians.

Back at headquarters McGee is talking to Abby about Gibbs and Mann while Abby executes a computer program that shows what the child product of two photographs, namely Gibbs and Mann would look like, while Gibbs and Mann catch them doing so. While looking at a schematic Gibbs and Mann share some Chap-stik®, an act lost on McGee and Abby. McGee and Abby found the stream of McGuire’s final moments and show Gibbs and Mann. Gibbs and Mann return to the war room where a frustrated Gibbs leaves to do some thinking… at home.

Mann, who has previously been to Gibbs’s house, once again helps herself to an entrance, finding Gibbs is working on a new boat in his basement, where she wants to know where the other boat went (and where Gibbs is a walking billboard for Carhartt clothing). Gibbs informs Mann that Sharif is motivated by hate and revenge and not money and he knows this by looking into his eyes. Mann questions Gibbs on what the eyes reveal leading to the clincher in their relationship. Gibbs and Mann will consummate their relationship, but not until Sharif is apprehended. This speeds things along and adds that delicious tension that makes such silly television shows have some relevance — by providing vicarious pleasure.

But back to terrorism, after Mann takes her leave, Gibbs gets a phone call from Sharif, who informs Gibbs that he has the gas and that he wants six Chechen operatives released from Afghanistan or he will distribute the gas everywhere. Just to give Gibbs a taste, Sharif reveals he has tested the gas on six civilians — and Gibbs, scaring the shit out of him as Gibbs does not know how he would have been exposed.

After decontamination Gibbs receives word from McGee that Sharif conducted his second gas test under the guise of pest control officer spraying peoples' houses. Gibbs goes hunting for DiNozzo and sends Ziva after him, but DiNozzo is at Benoit’s apartment trying to find out what is bugging her. The subsequent conversation reveals the true natures of the diminutive and uppercase “no.” While she retires to the ladies room, DiNozzo snoops her computer and finds a previous suitor has come calling in an unwelcome fashion. A rift is brewing. At the same time, DiNozzo negotiates a communal bath but is drawn away by the news of another gas exposure. He calls Ziva and is on his way.