Nev Schulman, a New York-based photographer, receives an intriguing painting of one of his photographs from an eight-year-old girl named Abby Pierce, who lives in Michigan. Impressed by her talent, Nev initiates an online friendship with Abby, which expands to include her family, particularly her attractive older half-sister, Megan. As Nev's friendship with Megan develops into a romantic connection, they exchange frequent messages, phone calls, and even songs. Encouraged by his filmmaker brother Ariel and their friend Henry, Nev decides to document this budding relationship, anticipating a compelling love story.

However, as Nev grows more involved, he begins to notice inconsistencies in Megan's online presence and stories. Suspicions arise when Megan's singing voice found online is linked to another source. Determined to uncover the truth, Nev, Ariel, and Henry embark on a road trip to Michigan. What they discover leads to a startling and emotional revelation that challenges the nature of online relationships and the blurred lines between reality and virtuality. The journey forces Nev to confront unexpected truths and the complexities of identity in the digital age.