And Then There Were 64: The Murder on the Links by Agatha Christie

So... there is surprisingly little golf in this Poirot novel, given
its title, but there are many, many other things: an unfriendly
rivalry between detectives; not one, but two romantic subplots; and
lots of “continental” flair. Oh my. Come play with us… not in a
creepy-haunted-hotel-twins kind of a way, but in a
tumbling-vaudevillian-twins kind of way. I.e., goofy, and dopey,
but more fun.