After the mysterious death of their father, estranged siblings Emerald Haywood (Keke Palmer) and Ottis James (Daniel Kaluuya) reunite at their family's ranch in California. While staying at the ranch, supernatural occurrences affecting human and animal behavior start to be noticed by the family and its workers.

The siblings believe that their father's death is related to a giant cloud-like UFO appearing in the sky, and they try to capture proof of its existence on camera. They get help from tech salesman Angel Torres (Brandon Perea) and documentarian Antlers Holst (Michael Wincott).