On his first visit to the mouse amusement park, Albert claims he is not afraid, he simply does not like rides that go up and down, left and right, or around and around, but things change when he and his sister Wanda accidentally ride the roller coaster.

Albert and Wanda want to invite a friend over to play on a rainy day, but they soon count fifteen mice in the walls of the People House.

Albert the mouse decides to make a batch of muffins but must borrow more and more ingredients from his friends until his sister, Wanda, helps him learn a lesson about sharing, using the concept of ordinal numbers.