Seven years after her older brother's mysterious death, Samantha Darko embarks on a road trip to Los Angeles with her friend Corey. Their journey takes a surreal turn when their car breaks down in a small Utah town, leaving them stranded. Attempting to make the best of their situation, Samantha and Corey are drawn into the lives of the townsfolk, including a fervent preacher, his rebellious son, and a tormented Iraq War veteran. The town, struggling under economic hardship and societal issues, becomes the backdrop for Samantha's increasingly strange visions and foreboding premonitions that hint at a looming catastrophe.

As Samantha's visions grow more intense, they begin to reveal connections to her deceased brother, hinting at a deeper, more complex relationship between her current experiences and her past traumas. With the help of a local science enthusiast, she delves into theories of time travel and quantum physics, attempting to make sense of her disturbing premonitions. The line between reality and imagination blurs, leading Samantha to confront her brother's legacy and her own role in the unfolding events. Her journey becomes a quest for understanding and redemption, against the backdrop of a community on the brink of its own disaster.