"The Penderwicks in Spring" is the fourth book in the Penderwicks series by Jeanne Birdsall. Set during the spring season, it follows the four Penderwick sisters—Rosalind, Skye, Jane, and Batty—as they navigate new challenges and adventures. The story explores themes of family, friendship, and growing up. In this installment, the sisters deal with changes in their lives, including Rosalind's first romance and Skye's struggles with her identity. The narrative captures the essence of childhood and the bonds that hold the Penderwick family together, all while introducing new characters and experiences.