Isaac Anderson in The New York Times Book Review of March 24, 1935 began his column by saying, " Murder by poisoned dart, such as primitive savages blow from blow-guns, ceased long ago to be a novelty in detective fiction, and murder in an airplane is by way of becoming almost as common as murder behind the locked doors of a library, but the combination of poisoned dart and plane is probably unique.

Isaac Anderson in The New York Times Book Review of February 16, 1936 finished his review by stating, " This story is a baffler of the first water, written in Agatha Christie's best manner.

Isaac Anderson in The New York Times Book Review of October 7, 1934, said that the motive was " most unusual, if not positively unique in the annals of crime.

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