For the passengers on the noon flight from Paris to Croydon, a routine journey becomes a nightmare. In mid-air a brutal and ingenious murder is committed. One of them must be guilty of it.
Or is it the writer of detective novels, trying out an idea for his latest book?
Or the countess whose passion for cocaine and gambling has already got her into deep trouble?
None of them is beyond suspicion. Not even Hercules Poirot himself. He must unravel this baffling mystery - if only to clear his own name.