Hardy Boys 15: The Sinister Signpost
| By: | Franklin W. Dixon |
| Publisher: | Penguin US |
| Print ISBN: | 9780448089157 |
| eText ISBN: | 9781101076293 |
| Edition: | 0 |
| Format: | Reflowable |
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In one of the most dangerous and intriguing cases of their careers, Frank and Joe Hardy help their father investigate a series of mysterious car accidents. Each of the drivers had seen a signpost marked DANGER shortly before his accident. The young detectives investigate, only to discover that the signposts have vanished. The attempted theft of a secret experimental motor and the kidnapping of a famous race horse are part of this thrilling case, which proves to be as sinister as the signposts themselves.