Two decades have passed since the Visitation, when aliens visited Earth. The landscape has been left permanently altered. The so-called "Zones" remain quarantined, full of extraterrestrial disease, incomprehensible anomalies, and mysterious debris. Scientists continue to study the remains of the aliens' visit, and scavengers called "stalkers" prowl the Zones in secret, putting their lives on the line to steal artifacts for the black market. This short novel follows one such stalker, Redrick "Red" Schuhart, tracing the impact of the Zone on him and the other people in the adjacent semi-deserted town of Harmont.

I read this book in one sitting, as the premise is incredibly compelling. While the book would have been interesting enough had it focused entirely on the stalker's perilous adventures in the Zone, a great deal of attention is devoted to exploring how contact with the capital-U Unknowable changes the characters. The aliens themselves never make an appearance, and rather than a first contact scenario it's suggested that we humans are merely terrified and uncomprehending insects picking over the incidental litter of their brief visit (the titular "roadside picnic"). Despite their close proximity to the unknown, the humans largely continue to be driven by self-interest, lusting for money and fame. Despite this—if my interpretation of the ambiguous finale is correct—the book ends with the faintest glimmer of hope that humanity can move past their baser instincts.

Despite all the mystery and unanswered questions, this was an exciting and satisfying read. Although there are no direct connections, I think fans of Lovecraft's cosmic horror will especially appreciate this book.