Other editions of book The Secret of the Old Mill

The Hardy Boys series, first published in 1927, has sold more than 70 million copies! Now with a brand-new look, this is an edition that collectors won't want to miss! In The Secret of the Old Mill, the third book in the incredibly popular, long-running series, Frank and Joe Hardy are on the case to bust a counterfeit money ring. A special treat for Hardy Boys fans and any reader who's new to the series.

"Drop case or else danger for you and your family."This warning addressed to Denton Hardy not only alarms the famous investigator and his detective sons, but also puzzles them, because Mr. Hardy is working on more than one case. Which one prompted the threat?When more ominous warnings follow, Frank and Joe suspect there is a link between the counterfeiting case they are investigating and a secret case their father cannot discuss because it involves national security.The key to the solution of both cases appears o be hidden in the old Turner Mill, constructed in frontier days but now a gatehouse for Elekton Controls Limited engaged in manufacturing top-secret electronic parts for space missiles. But the millhouse is occupied by two Elekton employees who are hostile to Frank and Joe and refuse to allow the young detectives to question the companies’ fourteen-year-old messenger boy who may unknowingly be in possession of some vital clues.