 Mrs. Brown is taking a course on how to be a private detective, and her first assignment is to prepare a dossier on an unsuspecting person. Her choice of subject is Martin. Of course, Martin knows what she s up to, but he is still a bit concerned about her discovering his Martian identity. Mrs. Brown finds Martin s flight log, which is written in Martian, but again Martin is concerned since the uneducated are too dense to know any better. She takes a photograph of it, which Martin is worried she will pass onto authorities, who, when they are unable to decipher it, will suspect him of being a foreign spy. She apparently has mailed the film to her teacher, J. Nathaniel Pierce, who is more shyster than teacher. Martin needs to apprehend the film before Pierce gets a hold of it. At Pierce s office, Martin searches to no avail, and must endure a sales job by Pierce before he finds out that the mailman can t and won t deliver Mrs. Brown s film since she failed to put postage on the package. From there, it s a an easy task of levitation for Martin to get the film and ultimately protect his identity. For Mrs. Brown s own safety, Martin tries to talk her out of taking the course since she will be facing brutish criminals. She heeds his advice: instead of quitting the course however, she decides to protect herself by also taking judo lessons.