The Dule Tree of Cassillis is a book written by William Robertson and published in 1903. The story is set in Scotland and revolves around the Cassillis family, who are known for their wealth and power. The book tells the tale of the Dule Tree, a tree on the Cassillis estate where couples would go to make promises of love and devotion to each other. The story follows the lives of several characters, including the Cassillis family members and their...