Product Overview
Author: Dixon, Franklin W.
Age Range: 8 - 12
Grade Level: 3 - 7
Hardcover: 192 pages
Publisher: Grosset & Dunlap
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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.
