Hardy Boys 9 - The Great Airport Mystery

Valuable electronic parts containing platinum are being stolen from shipments made by Stanwide Mining Equipment Company's cargo planes, and Frank and Joe Hardy are called upon to assist their world-renowned detective father solve the baffling case. At Stanwide the boys pose as employees, and become suspicious of their boss's hostility toward them. Is he involved in the racket? And what is the truth behind the plane crash at sea in which Clint Hill, chief pilot for Stanwide, was killed? Frank and Joe launch an aerial search for clues to the platinum thieves' hideout, believing that they will also uncover the mystery behind Hill's accident.