This is an enjoyable quick read. The epistolary style of narrative gives voice to the disparate main characters and propels the plot along nicely. As witnesses to and participants of World War Two are passing on or superannuated, this book is a reminder to modern readers that we cannot take our comfortable lifestyles and personal freedoms for granted.
My biggest quibble with this book is with a number of overlooked details that were not corrected or edited out prior to publication. The most egregious of these errors pertain to the musical references which, for a book with the word Choir in its title really should have been caught. Anyone who has ever sung in a choir would recognize that choral conductors do not use batons. They use their hands to get maximum expressiveness from the singers (The only exception to this is when the choir is singing with an orchestra. ). As well, the author mentions many hymnbook standards that are arranged for four parts (soprano, alto, tenor and bass or SATB). For women's voices these vocal lines would need to be carefully arranged for SSA or SSAA. Arranging music is a time-consuming and demanding art which usually takes an expert musician such as an organist or pianist to accomplish. I personally found the musical content to be disappointingly slap-dash which bothered me as I read the book. As well, there were a number of anachronistic words and phrases such as "wimp". Finally, the baby switching plot was simply daft, especially as it came to nothing.
Other recent WW2 novels I've read which are far superior in terms of historical accuracy and just plain better stories are: The War That Saved My Life and The Guernsey Literary and Potato Peel Pie Society, and to a slightly lesser extent The Nightingale. Be sure to check these out too!