William Shawcross's official biography of Queen Elizabeth the Queen Mother, published in September 2009, was a huge critical and commercial success.One of the great revelations of the book was Queen Elizabeth's insightful, witty private correspondence. Indeed, "The Sunday Times" described her letters as "wonderful . . . brimful of liveliness and irreverence, steeliness and sweetness." Now, Shawcross has put together a selection of her letters, drawing on the vast wealth of material in the Royal Archives and at Glamis Castle. Queen Elizabeth was a prolific correspondent, from her early...