Megan Crespi is back in Europe researching for a biography on "the other Mendelssohn," Felix's sister Fanny, also a prolific and until recently long overlooked composer. She is joined by three colleagues from the fields of music, museum, and photography. They encounter a spate of antisemitic demonstrations masterminded by neo-Nazi organizations in the two German cities associated with the Mendelssohns, Hamburg and Berlin. American composer Simon...