Result publisher "Spoken Realms" in Social & Life Skills

Frank and Joe Hardy are excited to see the new mail planes landing near Bayport, until an out-of-control aircraft nearly crashes right on top of them! Their quick thinking saves their lives...but not the plane. And the angry airmail pilot, Giles Ducroy, blames the Hardy boys for his crash! Worse, the boys soon discover Ducroy has fallen in with two shady crooks, Ollie Jacobs and Newt Pipps, who are plotting something big. Their mysterious scheme might strike right at the heart of Bayport's booming airmail business.

At their home in Bayport Frank, Joe, and Fenton, receive a visitor who informs them that Professor Morgan Todd from Kenworthy College has disappeared. At the time Fenton is working on security for a coastal radar station, which is under construction. The boys visit the college and are informed that the professor is away in Europe. However, the boys become suspicious, and their investigations lead them to Honeycomb Caves in Rockaway, where they uncover a plot to disrupt the operation of the radar station.