RB139 Stumpy's Harmonica

Stumpy’s harmonica playing is driving everyone at ranger headquarters crazy. Meanwhile, 20 miles away, a thunderstorm sets off blasts at Brown Brothers Quarry trapping several men. The rangers help the miners rescue the trapped men after hours of digging. Next Stumpy and Henry are buried alive by more explosions. They have no way of being located. Who can save our rangers from their rock tomb?