While vacationing with their widowed father in the Berkshire Mountains, four lovable sisters, ages four through twelve, share adventures with a local boy, much to the dismay of his snobbish mother.

When the three younger Penderwick sisters go to Maine with Aunt Claire and are separated from oldest sister Rosalind for the first time in their lives, an uncertain Skye is left in charge as the OAP--oldest available Penderwick.

The Penderwick family return to Arundel for Rosalind's wedding, but Lydia, who has only heard stories of the grand estate, is eager to explore the place where her older siblings had endless adventures. Nine years, five older siblings, a few beloved dogs, and an endless array of adventures--these are the things that have shaped Lydia's journey since readers first met her in The Penderwicks in Spring. Now it's summertime, and eleven-year-old Lydia...