From despair from a serious illness of the son, the father should get a huge amount. He had no choice but to go on the study areas in the Exclusion Zone. That is where begins the real adventure of Peter: he becomes friends with a cheerful company, find artifacts for analysis, to see strange mutations in the likeness of men, kill them and move through the danger zone, anomalous bubbles popping in the air. All the dialogue is fully voiced, you can interact with many items and even solve puzzles.