In this horror-thriller, M. R. Carey (whose previous stuff I'm not familiar with) takes a popular, over-used trope and gives it a fresh biological twist. While this does mean that a good deal of the plot follows the well-trodden road of a band of survivors trying to get somewhere while avoiding grisly deaths, there's enough difference to keep things interesting.
For starters, the main character and first viewpoint we're introduced to is a ten-year-old girl, Melanie. While her nature is made clear to the reader fairly quickly, there's still a few pages of disquiet in which you're left wondering why a little girl needs locking up and restraining. Her thought processes and language feel credible, but not to the point that you feel you're reading a children's book. This is far from that.
Most of the other characters are similarly compelling, although I did sometimes struggle to differentiate between them as the style and wording of their viewpoints didn't seem particularly distinct from one another. Credit goes to the author for slowly turning a standard army guy into someone more individual and more likeable, and for making the character who serves as Melanie's 'defender' unexpectedly conflicted.
Carey's prose is snappy and engaging, if occasionally a bit over-wrought. I definitely wanted to come back for more when I had to put the book down, although towards the end my attention began to slip a little - I started to get bored with the standard survivalist trajectory. The ending itself took an unexpected path, although the reasoning for it felt rather murky. If a sequel follows I think I would pick it up.
This isn't a gentle supernatural tale, but I recommend it for fans of fast-paced horror-thrillers.