Manic Pixie Monster a.k.a. Never Go to the Second Location: The Golden Ball by Agatha Christie

We have been here before, and we will almost certainly be here
again. It's time for another kookily "romantic" story in which two
young things banter their little hearts out to what seems to be to
them--if not us--a satisfying conclusion. It's Listerdale Mystery
time, and good God but this one hinges on a piece of fruit, too.