The Alice Network, by Kate Quinn, was quite a turn from the prior several books. A thoroughly adventurous set of protagonists make their own way — one in war and one in escaping the constrictive life of a "proper girl". The two main characters are visited in alternating chapters, and across a time gap of around thirty years, as their paths eventually intertwine. The character development is strong, the sense of place in history is even stronger, in this story set in the time of the Great War (1914-1918) and post-World War II (1947-1949).
This book was recommended to me by my sister Kelly and is in the to-be-read pile of my sister Kartika. I had to put this book down multiple times to breathe, steady myself, and confront discomfort from some of the very visceral scenes. I couldn't recommend this book to young readers, but I heartily recommend it for older readers who seek adventure, complex situations, and historical liveliness.