In 1933, Joan Harrison was a twenty-six-year-old former salesgirl with a dream of escaping both her stodgy London suburb and the dreadful prospect of settling down with one of the local boys. A few short years later, she was Alfred Hitchcock's confidante and one of the Oscar-nominated screenwriters of his first American film, Rebecca. Harrison had quickly grown from being the worst secretary Hitchcock ever had to one of his closest collaborators,...