A Marine, Maslin, administratively separated without an honorable discharge, attacks and beats a Japanese man tourist, who dies later; Callen and company investigate; G and Sam realize that they're not the only people looking for him; Kensi and Deeks also turn up nothing. With Eric's help, G and Sam find Maslin plus some bad guys with bad wheels without plates; Maslin tells a long story, which the team at first fail to verify; G and Sam meet a highly respected Japanese businessman visiting Los Angeles; next the US Department of State requests that the NCIS withdraw from the case. The team begin to gather confirmation, and Kensi offers housekeeping services, but nobody buys; Deeks gains an advantage. Hetty advises the team to become modern ninjas, so every member of the team takes on a new role, providing services to a departing aircraft and its cargo and passengers. Everything goes according to plan, a couple become reunited, and a Marine sees a better future.