I could not resist. Although I have not read a lot of the original Agatha Christie novels, the David Suchet ‘Poirot’ films are at the top of my list of mystery favorites. Hannah has the permission of the Christie estate to revive the character and has written others in the series as well. This story begins with four different people receiving a letter supposedly from Hercule Poirot himself, each being accused of murdering a man who everyone thought had simply drowned while taking a bath. He was elderly and frail and the inquiry returned a verdict of accidental death earlier in the year. So why would someone send these letters to the recipients, all but one of whom did not know the deceased? Poirot considers the question at a cafe where he has ordered a specialty of the house, a slice of cake with layers colored like a checkerboard. He cuts each colored layer in two and then in two again, the four quarters, representing each of the accused murderers. Are they working in pairs or are they all on their own? Is one of the squares the real murderer or are all of them innocent? In which case, why send the letters in the first place? The novel is very well done and I hope to find time to read others in the series.