Brina, a city cat, moved to the mountains with the owners for a summer holiday. Here she meets some stray cats who call themselves "The Gang of the Feline Sun." The new friends convince her to escape her owners and become a free cat. But while Brina enjoys her newfound freedom and all the new types of delectable bugs the countryside has to offer, her young owners are panicking over losing her, a member of their family. Brina must make a choice to live with her owners, where it's safe (but confined) or go free in the wilderness.