As if backpacking across the Grand Canyon isn't hard enough, Amy crosses paths with a murderous drug dealer who has stumbled into the Canyon.
Blade and Dawg, inept drug dealers, are running from a violent drug buy. Their PCP-impaired judgement and a piece-of-shit car leave the men stranded on the rim of the Grand Canyon. One of them ends up dead.
Retired businesswoman and novice backpacker, Amy Warren, and her new friend, Sarah, discover the mangled body in a ravine at the start of their arduous Rim to Rim hike. The murderer blends into the backpacking crowd and crime stalks the two women for a week along the trail, Amy and Sarah will not be deterred by man-made or natural dangers. Ranger Rob Hansen is on duty and wants to lend assistance. Though Amy is attracted to him, she fends off his offers of protection and his growing affections because she is determined to overcome the challenges of the Grand Canyon on her own––and because she is married.
The murderer's drug-induced paranoia convinces him that Sarah and Amy are stalking him to steal his stash of wack. On a lonely, precarious cliff they settle it in hand to hand combat.