Tense Yet All Too Real. "Book 0" of this series, The Paris Orphans, does a much better job of setting up the overall series than this particular book does - and yet this particular book actually does a far better job of showing what we're in for with the rest of the series. Here, we get an all too real world in both WWII era Paris and 2010s era England. Yes, this is a dual timeline, and yes there are the usual linkages there. There are also multiple character perspectives, but both timelines and perspectives are switched well. The tension throughout both timelines, though wildly divergent (and appropriate for the given timeline) is done quite well, with brief moments of reprieve sprinkled throughout the story before the tension is ratcheted up even higher. The setup for Book 2 is sprinkled in later in the text here, but the Epilogue is essentially a stinger to make you want to pre-order Book 2 immediately. (Which I don't even think is possible as I write this review on release day.)
Overall a solid tale of its type, with an intriguing twist of the idea of having s linked series of sisters and their tales during the war (along with, presumably, a post-war dual timeline of some form). Very much recommended.