Following the trend of eastern bloc writters in this thread I'm gonna go for Roadside Picnic by Boris and Arkady Strugatsky, the novel that the film and videogame STALKER were based off of.
An alien visitation to earth has left it scarred and ruined, but vast new technologs are to be fond in the hazardous exclusion zones left behind, cordoned off by the military stalkers will sneak in and steal them to sell on the black market. It's wonderly imersive and descriptive, you feel a real sympathy for the main character as he is forced to do this dangerous job of guiding tourists into the Zone in order to make ends meet, risking his life in the dangerous zone and at home as organized crime brings many dangers and the millitary start to crack on illegal stalkers. But forced to go back for 'one last job' with the promise of all your greatest wishes coming true. The ending is wonderfull but I wont spoil it, far more intelligent people than I have analyised it throughly and I still don't quite understand it.