Robin Scott, in Tokyo between planes, is urged to take on a local insurance job: the recovery of two stolen samurai swords of great historical significance. Robin turns down the job until Masako Takata, a samurai maiden, persuades him to take it. The honor of Masako's father is involved. If those Ronin swords are not returned to Prince Kanno in three days, Takata and Masako, father and daughter, must fulfill the code of the samurai and take their own lives by hara-kiri. It almost costs Robin his life to learn that Kanji Saiki and his father stole the swords deliberately to dishonor Takata, knowing that this would bring death to Takata, removing business competition, clearing the way for huge Saiki profit. Robin enters the Saiki house and recovers the stolen swords after fighting Kanji for the samurai honor of Masako. But when Robin tries to deliver the swords to Prince Kanno, clearing Masako and her father of all dishonor, Mr. Saiki influences the Prince against Robin. Robin finally proves to the Prince, with Masako's help, the infamy of the Saikis.