In the Ranger Bill episode titled River of Fire, the story begins with Ranger Bill and his fellow officers, O'Rourke and Ryan, on their nightly patrol in the quiet town of Utty Pine. While walking their beat, they notice a strong smell of fuel oil coming from the river. Initially dismissing it, their instincts kick in, prompting them to investigate further. As they approach the river, they discover a disturbing sight: the water is covered with a thick layer of oil, indicating a serious leak from a nearby pipeline.