Starring Jodie Foster, Helen Hayes and David Niven. It is a movie full of reminiscing for me. I watched it often as a child. The movie is 2 years older than I am.
Jodie Foster starts as Casey, a young girl entangled in a treasure hunt. She pretends to be the long lost granddaughter of Lady St. Edmund's in order to get closer to the clues, but ends up getting closer to the family.
A very nice 70's Disney film, recommended for the whole family.