Magnum, P.I. S03E14 - The Arrow That is Not Aimed

Higgins sends Magnum to collect a valuable Kenzan porcelain plate, newly purchased by Robin Masters, from the airport, but the artifact, which was entrusted to the care of a samurai warrior named Tozan while in transport from Japan, has been stolen by a ninja. Magnum teams with the samurai, but they must work fast, as the samurai code of honor dictates Tozan must commit Seppuku if the precious plate isn't retrieved.