In the final miles of the Cocodona 250 ultramarathon, runners descend through Flagstaff, Arizona—terrain as unforgiving as it is redemptive. But beneath the surface of these trails lies a darker history. In 1988, near this same course, 9-year-old Jennifer Wilson disappeared. Her body was later found near Sheep Hill.

This episode tells the story of two brothers: Richard Bible, who would be convicted of Jennifer’s murder, and Mark Bible, the man who turned him in.

Told through the lens of an ultramarathon's final push, Chapter 5 is about betrayal, reckoning, and the high cost of doing the right thing when it’s almost too late. Mark’s call to authorities didn’t just crack open a case—it shattered a lifelong bond.

The finish line isn’t just a place. Sometimes, it’s a decision.