While visiting the estate of Arundel during their summer holiday, the Penderwick girls bask in the lush and beautiful environment where they explore a treasure-filled attic, play in a wondrous garden, dine on tasty homemade cookies, and make a new friend with the handsome owner's son.
The Penderwicks are four sisters, as different as chalk from cheese, yet as close as can be. Chaotic adventures ensue, and their holiday soon turns out to be a summer the girls will never forget...