Within a few months of Edward VIII becoming new ruler of a vast empire in 1936, he brought about a constitutional crisis that threatened the future of the British monarchy. He proposed to marry American socialite and divorcee Wallis Simpson. Both Prime Minister Stanley Baldwin and Archbishop of Canterbury Cosmo Lang opposed the marriage as they argued it would compromise Edward's role as head of the Church of England. The church's battle with the new King over his role as moral leader of an empire is chronicled in the diaries of Alan Don, chaplain to the Archbishop of Canterbury. His great-niece, Charlotte Laing, discovers how Don's writing charted the crisis with Wallis divorcing her husband, therefore leaving her free to marry the King. Alice Ravenscroft learns that her great-grandfather was Wallis' lawyer, tackling one of the most significant divorce cases of the 20th century. He successfully negotiated the minefield that was divorce law between the wars. The Bishop of Bradford became the greatest whistleblower of the 20th century and ended the press blackout on the story of Edward and Wallis. Fiona Crace hears how her ancestor gave a sermon in December 1936 to his diocese, in which he criticised the moral leadership of the King.