Susan Fisher is working alone, on a Saturday, when her employer's little boy, Carlton, leaves a shoe box with her. Susan looks inside and finds $200,000 in $100 bills. She puts the box in the company safe but soon after gets a call from Los Angeles airport from the company owner, the elderly and wheelchair bound Amelia Corning, who Susan picks up at the airport and returns to the office. The old woman is particularly interested in checking the books, which she takes with her, for the the Mojave Monarch mine. Susan contacts her boss, Endicott Campbell, to tell him about the owner's unexpected arrival and also about his son's shoe box full of money. Susan contacts Perry Mason who asks Paul Drake to look into the Mojave Monarch mine. He learns, from site manager Ken Lowry, that the mine has been closed for some time even though he was ordered to send in salary sheets. A second Amelia Corning arrives the next day further confusing things when she disappears along with the first Amelia Corning. When Lowry is later found dead by the side of the road, Susan is charged with murder.
—garykmcd