Series
Hardy Boys ;
#03
Summary
Read by Bill Irwin. 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. Full description
Series: Hardy Boys mystery stories
The tower treasure (Volume 0001)
The house on the cliff (Volume 0002)
The secret of the old mill (Volume 0003)
The missing chums (Volume 0004)
Hunting for hidden gold (Volume 0005)
The shore road mystery (Volume 0006)
The secret of the caves (Volume 0007)