After months of planning, the NCIS family celebrates the wedding of Kensi and Deeks. Also, an old acquaintance, Anatoli Kirkin, pays Deeks a surprise visit on his wedding day and he isn't alone.

Department of Justice Agent Lance Hamilton asks Sam for assistance in locating a former U.S. border patrol tactical officer who disappeared following a threat by the cartel. Also, Kensi and Army Criminal Investigative Department Special Agent Steve Evans partner on a dangerous mission to recover a stolen hard drive with sensitive military intelligence on it.