Native New Yorkers Nick and Moselle Damaskós are relocating to coastal Georgia after winning an online auction for a beautifully restored antebellum mansion. Unbeknownst to them, the estate is tied to Moselle's lineage—it was once the plantation where her ancestors were enslaved.

Soon after, Moselle and her young daughter are haunted by vivid nightmares involving water—visions linked to the 1864 Massacre at Ebenezer Creek. According to legend, Moselle's great-great-grandfather, Ezekiel, witnessed the atrocity as a child. His mother and sister were among the casualties. Now, his memories live on in Moselle.

Nick learns about Ezekiel's legacy while traveling south to close on the house. Behind the estate lies a mysterious pond, believed to be inhabited by local water spirits known as basimbi. As Moselle arrives with the children, the mystery of Old Meyer Pond begins to unravel. They have been summoned—called home by the spirits.

While fulfilling their creative ambitions, the family falls under the rapture of their ancient aquatic landlords. What follows is a tale of retribution, delivered in a most unexpected way.v