There is never a dull day on Big Sky Mountain! Rain or shine, there is always something that needs doing. Rosa and Grandma Nan are busy building a bigger cabin when a storm strikes, and a host of animals descend for shelter. There is one unexpected visitor: a tiny wolf cub. This little wolf doesn't seem like the scary, giant-fanged forest wolves that Rosa has heard about! Can the cub really be part of their pack? Rosa and Grandma Nan set off into the forest to find out...