Maurice Baring 
In The End Is My Beginning [PDF ebook] 

This historical novel tells the tragic story of Mary Queen of Scots, from her childhood until the beginning of her end, whose unwise marital and political actions provoked rebellion among Scottish nobles and forced her to flee to England, where she was beheaded as a Roman Catholic threat to the throne. The clash of opinion over whether Mary was a martyr or a murderess is perfectly represented by four eye-witnesses (The Four Maries – her ladies-in-waiting) who narrate this captivating story with distinctive conclusions.