And Then There Were 60: The Big Four by Agatha Christie

How do you fit a square peg in a round hole? Awkwardly! In this
case the square peg is our beloved M. Poirot, and the round hole is
one of Dame Agatha's breezy thrillers from her early years. And yet
all is not lost: there is much to love in this episodic novel--and
in its adaptation, aired during the final, sepia-tinted season of
the Suchet series.... It's 2017 and our resolution is to read as
much Christie as possible; let's do this.