Mary Monica Hope Scott was born in 1852 and married the Hon Joseph Constable-Maxwell in 1874. They adopted the surname Maxwell Scott.

Mary Monica followed her great grandfather and became a writer of historical books, including an authoritative guide to Scott’s precious collection of ‘gabions’ entitled Abbotsford: a Guide to the Personal Relics and Possessions of Sir Walter Scott.

At one point the only living descendant of Sir Walter Scott, Mary Monica had eight children, five of whom survived her. On her death in 1920 her eldest son, Walter, inherited Abbotsford.