The legendary names include Rothschild, Mendelssohn, Bloch-Bauer--distinguished bankers, industrialists, diplomats, and art collectors. Their diverse taste ranged from manuscripts and musical instruments to paintings by Old Masters and the avant-garde. But their stigma as Jews in Nazi Germany and occupied Europe doomed them to exile or death in Hitler's concentration camps. Here, after years of meticulous research, Melissa M ller (Anne Frank:...