A shimmering ghost walks by night with his spectral henchmen in the shadow of an old deserted lead mine. Is it the phantom ghost of a Union captain killed so long ago in the days of the Civil War –– or is it a fraud?

     At the urgent request of his sister Barby, Rick Brant and his sidekick Scotty fly down to the sleepy Virginia town from the Spindrift Scientific Foundation to see for themselves the eerie apparition at Old Mine Campground.

     The clues to the baffling mystery are few. Discovery of a carefully hidden radioactive cement bag, the strange death of a mob of microscopic creatures, and the suspicious actions of the Frostola man are all the leads that Rick and Scotty have to go on. Yet each clue to the true identity of the Blue Ghost draws Rick and Scotty inevitably closer to the hidden secrets of the old deserted mine shaft.

     A microscope, a hastily rigged radio set, and Rick's pocket lens help Rick and Scotty to solve the riddle of the reappearing phantom –– but not before the two young scientists more than once meet danger at the hands of the Blue Ghost of Old Mine Campground.