Not bad as a debut. Short and punchy, with a fair few instances of slightly clumsy sentences and dialogue, but the plot is interesting enough. The neat idea of the killers is interesting, and the mystery drives the first half of the book nicely through your standard survival horror which pays homage to the first book of The Strain Trilogy, and David Moody's Autumn series without being too derivative.

That said, having settled the reader comfortably into this post-apocalyptic world, the characters' moral compasses suddenly swing a neat 180° half-way through the book, which means the second part of the book is jarringly different; gone are the feelings of paranoia and mistrust - we're into straightforward sneaking-about-with-guns territory. It also ends a little abruptly and not particularly clearly. Maybe it's supposed to be ambiguous, but it comes across more as unclear. Still, it'd be nice to see some more writing in a similar vein.