Frank and Joe Hardy, sons of the famous detective Fenton Hardy, may have met their match in these cases. In "The Mystery of the Melted Coins", Joe faces Blackbeard and not even Frank can help him. In "The Mystery of the Spiral Bridge", their father is kidnapped.
| Author | Franklin W. Dixon |
| Publisher | HarperCollins |
| Year of publication | 1994 |
| Number of pages | 320 |
| Language | English |
| Format | Paperback |
| ISBN-10 | 6945074 |
| ISBN-13 | 9780006945079 |
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