The team investigates the death of a retired Navy Lietenant, forcing Ducky to reveal his membership in a secret society that looks into cold cases on NCIS. "16 Years" is the seventh episode of the show's 13th season.
Tony: One other question, I know you're an expert in English history. And I was just wondering, have you ever heard of Archibald Drummond, the 17th Earl of Trent? Ducky: The Earl of Trent. No, I can't say I have. Why? Tony: I was just wondering. Thanks.
McGee: All right. Well you should probably know that Abby and I used to date? Bishop: Ew. Like, each other? McGee: Yeah. Bishop: Wait - isn't that a violation of rule 12, never date a.... McGee: It was a long time ago. After we'd broken up, one night I went to her lab. Found a scribbled piece paper; a list. Potential boyfriends had to fulfill certain conditions by a pre-arranged date or else, goodbye. Bishop: Such as. McGee: Things started off relatively normal: opening the door for her, flowers, putting the seat down. Then around number 8, it gets uh... Bishop: What? McGee: Does she know you have these? Bishop: Does she know you have these? McGee: Yeah she wasn't happy when she found out. Bishop: These are all very specific. McGee: Yeah. Bishop: These ideas apply to you? McGee: No those rules weren't in place when we were together. At least I don't think so. Bishop: What's with the two month cutoff? Abby's sabotaging herself. I've seen stuff like this before. We have to talk to her.