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.More
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This is really Book 2!
- Patrick Mooney
Another great mystery
Well, no. But it is a close second.
This story brought a little of the high tech into the series
When the arrow landed
When they broke out of the barn
I really enjoyed this series when I was a kid and now again as an adult in audio