Vintage The Hardy Boys ‘What Happened At Midnight’ Mystery Hardcover Book 10

Excellent preloved condition (see photos) Vintage 1967 The Hardy Boys ‘What Happened At Midnight’ Book 10 Mystery Hardcover Book By Franklin W. Dixon Frank and Joe race against time to retrieve a scientist's top-secret invention before thieves get their hands on it. But the young detectives soon discover that they are involved in a mystery far greater in scope than just safeguarding the invention. When Joe is kidnapped, this incident starts Frank of on a chase that could end disastrously for him and his pals.