When the Alden children go camping on Blizzard Mountain, a place said to be inhabited by a ghost looking for buried treasure, they begin to think someone or something is trying to scare them off.

While vacationing at a friend's country home, the four Alden siblings try to find a long-missing, priceless brooch and investigate the existence of a ghostly stream.

Henry, Jessie, Violet, and Benny, known as the Boxcar children, are visiting their friend Fran in Wisconsin and they can't wait to hear the tale of the runaway ghost.