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An energy drink company's, gruelling no-limits endurance mountain bike race comes into the heart of the park. When a top contender turns up dead, the investigation exposes a cutthroat world where survival isn't the only thing at stake.
A big rig is hijacked along a desolate highway bordering the park and authorities uncover a communication system allowing the hijackers to move undetected. The race is on when its discovered that the drivers's daughter was inside the rig.
When a podcaster is found dead on a remote trail, Nora recognizes unsettling similarities to a serial killer named The Botanist, reviving fears that a long-dormant serial killer may be active again.
A young boy goes missing during a Bigfoot event in the park. As the team scrambles to find him, some clues point to the creature itself, and others point to something more sinister at play.
A body found in the park is connected to stolen Native American artifacts. The NPS is assisted by the tribal police who suspect an exiled tribe member. Tracing his steps as he disappears in the park, the team discovers more at play.
At a secluded wellness retreat, a woman is found dead in a sauna. As the investigation unfolds, a web of hidden motives among the seemingly enlightened guests come to light, revealing a murder more calculated than anyone imagined.
A tour meant to help guests "disconnect" goes horribly wrong when a hapless guide gets the tour lost in the woods without their phones or GPS. The NPS team must track the stranded hikers before they get overcome by injury and exhaustion.
When Ryan's confidential informant disappears, the investigation pulls a thread that exposes an underground gun smuggling operation tied to the military, a notorious biker gang and Ernie, Jodi's former army partner.
