The Wailing Siren Mystery

The Wailing Siren Mystery is Volume 30 in the original The Hardy Boys Mystery Stories published by Grosset & Dunlap.

This book was written for the Stratemeyer Syndicate by Andrew E. Svenson in 1951. Between 1959 and 1973 the first 38 volumes of this series were systematically revised as part of a project directed by Harriet Adams, Edward Stratemeyer's daughter. The original version of this book was shortened in 1968 by Priscilla Baker-Carr resulting in two similar stories sharing the same title.

Plot summary
Their SOS ignored by a strange yacht in a storm, the Hardy Boys find a wallet alongside their speedboat, apparently dropped from a helicopter, containing two thousand dollars, and are launched into a mystery involving diverse clues. This includes finding out who kidnapped Jack Wayne and took his plane, and where the wailing siren is coming from. Early on in the story Frank is kidnapped by the criminals and left bound and gagged in a basement, with the intention to ransom him to his family. He escapes on his own, however. Near the end Frank and Joe are captured once again, and left tied to a tree by the gang of criminals.