The Hardy Boys - The Secret Panel - Vintage 1969

The Secret Panel is the 25th book in The Hardy Boys series, written by Franklin W. Dixon (a pseudonym for the Stratemeyer Syndicate, with Harriet S. Adams credited for the 1946 version). Published in 1946, the mystery involves Frank and Joe Hardy helping a man who turns out to be a ghost, leading them to investigate a deserted mansion with secret doors and a connection to a gang of thieves targeting museums. The book was revised in 1969, creating two versions of the story. Small callout; wear on top corner of binding