00989cam a2200265 4500 66389944 TxAuBib 20061113120000.0 061109s1987||||||||||||||||||||||||eng|u 9780448089034 0448089033 (OCoLC)229224891 TxAuBib Dixon, Franklin W. The Secret Of The Old Mill. New York : Simon & Schuster, 1987. 180p. Hardy Boys Mystery ; 3 Determined to learn the secret of the old mill, Frank and Joe employ a clever use to gain entrance and become trapped. There they unravel two mysteries, one involving a counterfeiting case and the other, a national security case their father is working on. 20061109. Mystery Juvenile fiction. Chapter Books. Hardy Boys Mystery ; 3. TXPLE