This book takes place during the Blitz which is a real organizing factor for a lot of what happens.Maisie and Priscilla are driving ambulances, the American Mark Scott shows up and is mysterious, people need to sleep wherever they wind up when the air raid sirens go off.I’d read a fair amount about the Blitz but it was nice to see your characters inside a bit of history to give it a little more rounding out. The central mystery to this book was better and more interesting than the one in the last book too which I appreciated.