The solution to this story is more than a little complicated with any number of coincidences but it is seemingly easily solved by Hercule Poirot.
A young girl, known for being an inveterate liar, declares that she has seen a murder. When no one believes her, she doubles down and says that she only just realized what it was that she saw. Still, no one pays attention. Even mystery writer Ariadne Oliver, visiting a friend, thinks the girl is lying in order to bulk up her social credibility. But then, during the Halloween party, the girl is killed. And, later, her brother. Mrs. Oliver does the sensible thing and calls on her friend, the famous detective.
This is an interesting story because we do get to see Poirot in nature (it doesn't go well) and the ending is a little more dramatic than some others in this series.
Three and a half stars
This book came out November 1, 1969
Follows Third Girl
Followed by Elephants Can Remember
Borrowed as audiobook from Libby
Opinions are my own