Counterspy - The Case of the Infiltrating Agent

David Harding, in the Counterspy Headquarters in Washington, receives an urgent message from the Buenos Aries Embassy that an enemy agent, named Ivor Sanderson, has just booked a flight to northern Mexico. Later, Harding receives a message from the Counterspy field office in Nuevo Laredo that a man answering Ivor Sanderson's description just got off a plane here this morning. Harding sends a message to all southern field offices to be on alert for the next 24 hours. He will personally fly to Laredo, Texas, and will provide specific assignments upon arrival. Meanwhile, an intoxicated tourist from Dallas named Harry is sitting in a bar in Nuevo Laredo, talking to a local girl, he believes, is named Pepita. She says "Harry, you drink too much. We go home". Harry says "Oh, no. No, Pepita. I'm having too much fun. I like Mexico. I don't want to go back to Dallas". Pepita says "You don't go back to Dallas until tomorrow. I mean my home". Harry says "Oh. Why didn't you say so?" Pepita says "Come, you lean on me. I will open the door". They get outside, and Harry says "There's my car". Pepita says "Oh, we don't have to drive to my house". Harry says "Oh, we don't?" Pepita says "No, I live right next door to the saloon". They get into her house, and Harry passes out in an easy chair. Pepita gets his car keys, and gives them to Carl, her partner. She says "It's the big Oldsmobile, right out front, Texas license plate JW360. Carl calls for Mr. Sanderson, and says "We must drive to the car to the garage to put the merchandise inside the tires. The man will wake up in four or five hours. Sanderson says "We are not putting the usual merchandise in the tires this time. We are smuggling something else across the border".