In Part 1, the Starved Rock Murders begin with Lillian Oetting, Mildred Lindquist, and Frances Murphy arriving for a winter getaway that turns into a terrifying search through the snowy park. What starts with missed calls, untouched lodge rooms, and a car left in the parking lot quickly becomes a devastating discovery in St. Louis Canyon, strange photos, possible witnesses, red fibers, lab problems, and the first clues that push investigators toward a young lodge employee.

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