About two-thirds of the way through this book and am enjoying it! A story of two sisters whose obsession over opera created escape routes for Jewish people to escape the Nazis on the eve of WWII. Here's one paragraph from the Goodreads synopsis:

"What can two middle-aged British spinsters do about such matters? They can form a secret cabal right under Hitler's nose and get to work saving lives. Along with Austrian conductor Clemens Krauss (a favorite of Hitler, but quietly working with the Cooks) the sisters conspire to bring together worldwide opera aficionados and insiders in an international operation to rescue Jews in the opera from the horrific fate that everyone intuits is coming. By the time war does arrive, the Cooks and their operatives have plucked over two dozen Jewish men and women from the looming maw of the Holocaust and spirited them to safety in England."

Edit: Just finished the book. The nuance and unflinching factual approach (the awkwardness, not POCness of the characters) was refreshing. Not that I want their failings, but I came away from the book thinking if people as faulty as these women and men could save lives (and also not save lives, and lose lives that they saved), then what can I do?