The Body Snatchers takes place in the northern California county of Marin. The main character is a twenty-something divorced doctor named Miles. In the beginning of the book Miles receives an office visit from an an old high-school flame named Becky. She is also divorced and the two still have a romantic chemistry. Becky is worried and explains to Miles that her cousin believes that the man claiming to be her uncle is no longer really her uncle. He looks the same, acts the same, talks the same....but something is just different.
Later, Miles receives more patients claiming that there friends or loved ones have been replaced by an identical person (or thing!). Miles feels this is all ridiculous and could be linked to hysteria. But, he visits a guy named Jack and the narrative then takes a spin into some really dark places.
Inside Jack's home, Miles discovers a nude body draped upon a pool table. Oddly, the body doesn't have any identifying features, as if it is still in the process of being formed or made. Jack shockingly claims that the body was infant-sized a few hours before Miles arrival. The idea is that this body is growing to eventually become a duplicate of Jack or his wife.
Eventually Jack, Jack's wife, Miles, and Becky find seed pods around town that suggest aliens are being created to look like humans in an attempt to integrate themselves secretly into human society. The narrative's first half is built on shock, awe, and suspenseful discovery. The concept is mysterious and spirals into a paranoid sense that the town is consumed by alien beings.
The second half of the book is a frenzied plot-development as the characters find themselves in a fight or flight situation as they prepare to leave town. Miles, again as a doctor, feels that it is his obligation and oath to protect the town. Together with Becky, he eventually talks with the alien impostors to discover their overall plan.
As much as I loved this book and the characters, the ending was extremely disappointing. This is a common complaint with anyone who has read this book. Finney just doesn't stick the landing and it doesn't have a suitable ending. His scientific explanation for the aliens arrival doesn't make any sense when you compare it to the book's ending. But, nonetheless it doesn't ruin the entertainment factor.
There are essays and detailed reviews of this book everywhere and one can journey down any rabbit hole to find influences and critical praise of the book's underlying message. As a fan of Finney's heist novels, I've noticed that the author often creates characters that wish to be something they are not. Often young characters will dream of being wealthy and independent which spurs them into committing crimes before facing defeat, rejection, and guilt. In many ways this book has that same central theme as the alien impostors explain how things are different (better?) when the humans give into the transfer of losing themselves to become this alien form. There is also quick references about the town planning on revitalization with a proposed interstate that will bring with it more traffic and commerce. Also, Miles complains that the replacement of the town's telephone operator for an automated system seems to be a sign that humanity is replacing itself. I loved the subtext that Finney injects into his narrative.
You owe it to yourself to read The Body Snatchers. Despite the ending, the book is frightening, thrilling, and influential to many of the “invasion” angles you see with science-fiction and horror genres to this day. Highest possible recommendation.