Eight-year-old Cassie Witting is upset when she finds out that her mother, Sarah, is expecting a baby, but writing in the journal that belonged to her brother Caleb helps her sort out her feelings and understand that Sarah will always love her.

The fourth book in the Sarah, Plain and Tall series by Newbery Medalist MacLachlan, now in paperback, continues the classic tale of the Witting family's life on the prairie.