The Unexplained Disappearance of Karla Marks (2017) Bryan and Karla Marks are a husband and wife team of paranormal investigators. While conducting an investigation at an infamous location known as "The Devil's Well", Karla mysteriously vanishes. Nearly a year after Karla's disappearance, a team of paranormal investigators head back to the location in order to uncover the truth about Karla's disappearance.