"This is one of the men who I think may be involved in the automobile accessory thefts." "Not a very pretty face," Penny commented. "No, and 'Rap' Molberg hasn't a very pretty record either. He's served several terms in the pen, though usually he's a little too smart to have anything proven against him. Rap is the ringleader of the well known Molberg gang. It begins to look as if the outfit had extended its activities to Belton City." "Is this Rap's description?" Penny inquired, indicating the Bertillon record which lay upon the desk. It consisted of a bewildering array of figures. 1.67.6 1.74.0 88.1 19.0 14-5 HGT OA TR HL HW "Can you decipher it?" Mr. Nichols smiled. "I know the HGT stands for height and TR for trunk, but what are the other abbreviations?" "OA means outer arm," the detective explained. "HL represents head length and HW indicates the head width. Of course all the measurements are reduced to meters, centimeters, and millimeters." "It looks complicated." "Not after you become accustomed to it. For instance, I can see at a glance that Rap Molberg is five feet and seven-eighths inches tall--or as it appears in Bertillon--one meter, sixty-seven centimeters and six millimeters." "I don't believe I'll ever care to be a detective," Penny smiled. "It's too much like studying the multiplication table!" "Crime detection is a scientific profession----" Mr. Nichols began, but Penny cut him short. "Tell me, did Jerry Barrows come to interview you this morning?" "No, and I very much fear we'll never see the young man. I made a point of looking up his juvenile court record and find he has none." "Then he must have given me a false name." "I suspect he did, Penny." "I guess it was silly of me to trust him. I didn't exactly believe his story at the time, and yet he seemed like a rather decent sort too." "I'd not worry about it any more," Mr. Nichols said kindly. "I'm afraid I've just done another foolish thing too," Penny declared. She then told him about the severed wheel rack. "Why, I'd like to examine those pieces of metal," the detective said with interest. "What did you do with them?" "They're in the roadster. I parked the car in front of the office." "Then I'll just go down and get them," Mr. Nichols decided. "I should have inspected the car more carefully last night but I was in a hurry. Wait here and I'll be back in a minute." During her father's absence, Penny amused herself by looking through some of the books on his desk. There were several weighty volumes devoted to criminology and law. She found them dull and turned with more interest to the photograph of Rap Molberg. He had the appearance of a typical man from the underworld. His eyes were hard and glaring; there were sullen, cruel lines about his mouth. The only unusual mark of identification was a long jagged scar across his left cheek.