The Pursuit of Pearls (Clara Vine series #4) by Jane Thynne

This is the fourth book in the series

Summary
-With 1939 starting, the drums of war are still pounding. Clara Vine is still pumping out movies at Ufa Studios, which is now Nazi-run and churning out movies to appeal to the masses. She is still spying on the Nazi elite and passing it to British Intelligence, with out trying to arouse suspicion from those she spies on. She is incredibly shocked to find out that a young woman named Lottie Franke, who was studying under Clara to learn about fashion design, is murdered on the grounds of the Faith and Beauty School, just one of a dozen Bride Schools and other culture-based schools to groom women into the perfect Nazi wives. The press have a field day, claiming this is the act of a mad man, but Clara will investigate to see if it is just that or her death was the result of trying to keep a secret