This novel was a hard one for me. I went in knowing that it was the 21st novel in the series, however I assumed, to my detriment, that it was a series that did not build upon the previous novels as much as it did; I thought it would be more like Agatha Christie‘s Poirot, and that they would all be separate entities. This made it difficult for me to follow the story. That aside, I enjoyed the mystery that is contained within this novel.