Trouble in the form of a jagged streak of lightning representing mysterious and powerful organization has dogged Hop and Tank's footsteps ever since their return to Lakeville. Hop had taken a young man who professed to be a student, up on a familiarization flight, when their plane suddenly spun out of control. The two of them parachuted to safety, but the student accused Hop of reckless flying, and threatened to ruin his reputation...