N or M review
This book, in the Kindle format, is one of the later books in the Tommy and Tuppence series. Agatha Christie does not break up the original grouping of characters, so even Arthur is brought back to play a pivotal role for all that it was not the highlight of the book. Her presentation of the characters at the boarding house where the book takes place does keep you guessing as to who the N or M characters are, in addition to the wandering female and the subset of other male characters that add to the plot. It was a good basic mystery that didn't take too much time to read and ended well, as they always do.