The Penderwicks by Jeanne Birdsall

When the four Penderwick sisters find themselves staying on a beautiful estate called Arundel for their summer holidays, they can’t wait to explore the wonderful, sprawling grounds. And even more wonderful is Jeffrey, son of Arundel’s owner- the perfect companion for their summer adventures. But Jeffrey’s mother is less than thrilled with the Penderwick sisters and warns the new friends to stay out of trouble. Which, of course, they will. Won’t they?

"Adults who have been longing to find books for children that remind them of their own beloved childhood favorites, look no further. Birdsall follows in the footsteps of Elizabeth Enright, Edward Eager, and Noel Streatfeild, updating the family story yet keeping all the old-fashioned charm."-Booklist, Starred