The Light Over London by Julia Kelly

When Cara Hargraves finds a diary as she is going through the items of an estate for an appraisal, she is intrigued. It's from 1940, and her boss, Jock, lets her take it home after the person hiring them says they have no interest in it. Soon, Cara is immersed in the story of Louise Keene, who defies her mother to train as a gunner girl to help with the war effort. Louise also details her romance with Flight Lieutenant Paul Bolton. Cara is determined to reunite the diary with Louise or someone from her family. Cara also finds herself moving on from her failed marriage with new neighbor, Liam McGown (a history professor), who teams up with her to locate Louise. The Light Over London brings to light the incredibly courageous work of the Ack Ack Girls aka gunner girls during World War II.