When F. Scott Fitzgerald was fourteen and living in the Crocus Hill neighborhood of St. Paul, he began keeping a short diary of his exploits among his friends, friendly rivals, and crushes. He gave the journal a title page--Thoughtbook of Francis Scott Key Fitzgerald of St. Paul Minn. U.S.A.--and kept it securely locked in a box under his bed. He would later use The Thoughtbook as the basis for "The Book of Scandal" in his Basil Lee...