Book details
The Mystery of the Spiral Bridge
The Hardy Boys, 1965 by Franklin W. Dixon
on Goodreads (1,413)
Description
In the thirty-sixth book of the Hardy Boys series, the Hardy boys face a difficult challenge when a new invention, a machine that can make a man invisible, is stolen from their father's client. The brothers travel to Kentucky to investigate a series of strange occurrences at a recently constructed bridge, finding themselves drawn into a web of danger and intrigue that requires all their detective skills to solve.