A test pilot and two teenage aides investigate reports of a spectral aircraft that has alarmed aviators and threatened the airfield’s business. Suspecting human trickery, they set up night flights, signaling plans, and the use of a second plane and flares to lure the apparition. The mission grows perilous when an engine cuts out and they make an unpowered landing in the marsh, forcing the younger companions to face fear while executing the scheme. The plot combines aerial adventure, methodical sleuthing, and practical flying skills as the team follows clues to reveal what lies behind the supposed ghost.