THE SINISTER SIGNPOST (HARDY BOYS) HARDCOVER
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. NOTE: GROSSET AND DUNLAP 1968, Fraying on cover edge , Spotting