You climb onto the roof of the monitoring station. It's -30 degrees Celsius out, and it's difficult to breathe or move around. In the snow, you can see tracks from some vehicle, and small footprints leading down to the front door. Sam joins you on the roof. He finds something red in the snow. "Hey, a candy cane! Can I have it?" You point your dosimeter at it. "Put that down. It's radioactive." Sam drops it. "A radioactive candy cane?" You scan the sky with your dosimeter. "Well, I can detect radioactivity to the east. Maybe it's from whatever landed on our roof." Sam point to the marks in the snow. "It looks like a helicopter landed here." You shake your head. "No way. We would have heard something." "Maybe Dirk saw something from his fishing hut." Sam points toward the hut, which is half a kilometer away. Where will you go now? Let's go to the fishing hut. Let's follow the radioactive trace.