 Trusted secretary Doris Mauldin steals $50,000 from the Colton Valley Farmers  Co-Operative and solicits the assistance of her boyfriend "Dusty" Dunn to transport the cash to a safe hiding place in his crop dusting plane. Her manager and co-workers vouch for her honesty and efficiency, but most of the other possible suspects are painstakingly eliminated. When Dan Mathews notices a white dust handprint on the back of Ms. Mauldin s dress, he deduces that she and Dunn are romantically involved. He utilizes a ruse that compels Ms. Mauldin to expose her involvement by attempting to flee with Dunn in his plane.