Bethlehem by Karen Kelly

This debut of one of the wealthy families that started Bethlehem Steel in the 1920s and the secrets they kept for years that would only threaten to come to the surface in the '60s.  Meddling families, forbidden first love and the women who kept the secrets hidden.  Joanna comes to Bethlehem to her husband's family estate to care for his mother and grandfather now that his father has passed on but she finds herself on the edge of a family and world where she has no place.  Living as the mistress of the house that already has two mistresses isn't easy so she looks to make friends with another outsider. Slowly the family secrets begin to come to the surface and Joanna has to try to find a place for herself in this family and keep her marriage together.  A quiet story but the atmospheric writing heightens the suspense.