Harley Quin and satterwaitte, and Parker Pyne are the detectives. Not all together of course because that would be improbable and impossible to write, but every one of them will try to figure out a murder which happen close to their homes, and was comitted by the same man (serial killer). And on the way, they will meet each other (like happen in The ABC Murders). I can see that happening: Tuppence arguing with Poirot on the way they should detect, Miss Marple embarrass Tommy when he treat her like an old innocenct lady (and of course Mrs. Oliver will tell him all about her ideas of women in the Scotland Yard), Harley Quin become friend of Parker Pyne (from some reason they seem like a good couple) etc. It could have been fun to read that kind of book, but it was also a lot of work for Christie to write five different plots whivh happen in parallel. I don't have to know the game of bridge well enough to appreciate this book. I read it some time back and hardly remember the characters as much but all in all,it was a lovely book. One that i clearly remember liking alot!!? It could have been interesting if Satterthwaitte had been in the book but he couldn't have filled any of the roles that were taken Poirot Master Detecxtive, Race Military Info about Despard, Battle The erving Policeman on hand and Ariadne the Woman's point of view if anyone could