The Hardy Boys - 3. The Secret Panel
AuroraMandeville
Frank and Joe are elated to get hired to find an invention by an eccentric man who used to live on the outskirts of Bayport. But then their father comes up against a wall in his own case and recruits them for help. Juggling the two mysteries keeps the boys on their toes, but when a missing person's case comes knocking at their door, the boys have to race time to find the answers to all of them before it's too late.