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.
A family, snowbound in a vacation cabin, discovers adventure in surrounding wild life, three children they find in the snow, and a search for a lost recipe.
The Alden children return to Surprise Island for a visit, and Benny's curiosity is aroused by a small yellow house that Grandfather doesn't want to talk about.