Roadside Picnic is a wonderful and classic SF story that suffers only a bit from the translation from Russian (this is the 2012 translation by Bormashenko (Hard to Be a God was not in my edition). At times it feels like the context gets lost or flow is interrupted by an odd word choice.
With that said, the story is wonderfully engrossing. It is a compelling situation, Aliens(?) visit Earth in 6 locations very briefly and leave. The story is about one location that happened to be an ordinary town in someplace like America, unclear, but unimportant. Our hero is a stalker, a person who illegally enters this tightly controlled zone to steal 'treasures' left behind after The Visit. They are mysterious and sometimes useful and all incomprehensible. Each run is a treasure hunt, mapping expedition, and game of 'Russian Roulette'. A slight turn the wrong direction can be deadly in the literal blink of an eye, or days later, or change you utterly for good or ill.
Why are those artifacts? Mysteries for humans to solve and demonstrate our capacity to join the universe of sentient beings? Deposits to improve our situation from a beneficent species? A vector for invasion? Evidence points to these ideas and more. And, what about the rumored truly unique artifacts that reside in the zone, one that is alleged to grant your innermost wishes? What could you want to ask for?
It's all so compelling and nothing is resolved. And, in that way it is brilliantly done, brilliantly constructed. Like much of life as we learn in our later years, nothing is resolved. Stunning event happens on Earth and, practically speaking, our corruption leaks all over it as much as it leaks all over us.
I recommend the book highly. An engrossing short read.
The story of its difficult publishing history in 1970s and 80s Soviet Russia is intriguing. But, we have assurance that this translation is of the original text and includes an postscript by one of the authors describing some of that history.