The novel is often compared to The Puppet Masters by Robert Heinlein.
In 1967, Damon Knight criticized the novel's scientific incoherence:[1]
The seed pods, says Finney, drifted across interstellar space to Earth, propelled by light pressure. This echoes a familiar notion, the spore theory of Arrhenius. But the spores referred to are among the smallest living things – small enough to be knocked around by hydrogen molecules...In confusing these minute particles with three-foot seed pods, Finney invalidates his whole argument – and makes ludicrous nonsense of the final scene in which the pods, defeated, float up into the sky to hunt another planet.
Under Jack Finney's entry in The Science Fiction Encyclopedia, John Clute remarks concerning the novel:[2]
Horrifyingly depicts the invasion of a small town by interstellar spores that duplicate human beings, reducing them to dust in the process; the menacing spore-people who remain symbolize, it has been argued, the loss of freedom in contemporary society. Jack Finney's further books are slickly told but less involving.
Galaxy reviewer Groff Conklin faulted the original edition, declaring that "Too many s-f novels lack outstanding originality, but this one lacks it to an outstanding degree."[3] F&SF reviewer Anthony Boucher found it to be "intensely readable and unpredictably ingenious" despite noticeable inconsistencies and its sometimes lack of scientific accuracy.[4] Astounding Science-Fiction reviewer P. Schuyler Miller reported that, once Finney sets out his premise, the novel becomes "a straight chase yarn, with several nice gimmicks and a not entirely convincing denouement."[5]
