# The secret of the old mill

By Franklin W. Dixon.

"The Secret of the Old Mill" by Franklin W. Dixon is a mystery novel written in 1927. Brothers Frank and Joe Hardy investigate a dangerous counterfeit money ring in their hometown of Bayport. When mysterious warnings threaten their family and clues lead to a renovated mill owned by a secretive defense contractor, the young detectives must unravel connections between suspicious bicycle deliveries, fake bills, and a guarded facility. As they follow leads involving a teenage errand boy and strange nighttime activities, danger closes in around them. (Summary by Project Gutenberg, written by machine.)

- Language: English
- Illustrator: Walter S. Rogers
- Subjects: Brothers -- Juvenile fiction; Mystery and detective stories; Counterfeits and counterfeiting -- Juvenile fiction; Hardy Boys (Fictitious characters) -- Juvenile fiction

[Read it](https://invisiblenetwork.ai/books/gutenberg/70236/read)
[Plain text](https://invisiblenetwork.ai/api/books/gutenberg/70236/text)

## Audiobooks of it

- [Secret of the Old Mill (Version 3 Dramatic Reading)](https://invisiblenetwork.ai/books/librivox/19800) by Franklin W. Dixon (4 h 24 min, English)

From Project Gutenberg. Public domain in the United States.