How often are we frank with random fellow passengers, not realizing that it could lead to—participation in a crime! On a train racing across the prairie to the West, a young successful architect, Guy, strikes up a conversation with a not-so-pleasant stranger—something insignificant, nothing obliging—complaining about his relationship with his wife. And the stranger makes Guy a terrible and unmistakable offer, one that, as turns out later, cannot be refused. The next morning everything that happened seems like nothing more than a bad dream, but the story is only beginning—and soon Guy realizes that his life no longer belongs to him…