"Sophie Mouse's brother, Winston, wants to help her build a fort in the woods, but Sophie Mouse tells him he should go home because he's too little. When she realizes that she could use his help, he's nowhere to be found!"--
Sophie Mouse return to school to find a frightening new student--a snake; goes to Weedsnag Way for some special berries; wants to learn to swim; and realizes she needs her little brother's help, but he is nowhere to be found.