This is a 1931 copy of The Hardy Boys What Happened at Midnight by Franklin W Dixon. This version was published by Grosset & Dunlap in the USA and has an inked inscription in the front.
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.