Hardy Boys 15
The Sinister Signpost
ISBN10: 0448089157 ISBN13: 9780448089157 Publisher: Price Stern Sloan Published: Oct 1 1975 Weight: 0.55lbs. Height: 7.50" Width: 5.00" Depth: 0.75" Language: English
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.