In 1965, legendary climbers TM Herbert and Yvon Chouinard climbed the Muir Wall on El Capitan while facing a brutal storm and not having a chance for a rescue. Fifty-five years later TM Herbert suffers from Alzheimer’s disease and struggles to remember his iconic climb. TM’s son, Tom Herbert, decides to attempt breaking the Muir Wall speed record to remember his father’s astoun...