A wealthy former mental patient, Olivia de Havilland, returns to her estate after a stint in a mental health facility, seeking rest and recuperation. There, she discovers the faint cries for help from beneath the ground, where a woman has been buried alive - or so she claims. Her family, however, is determined to prove her mind has snapped, seeing this as an opportunity to seize control of her vast fortune. As Laura Wynant's desperate attempts to uncover the truth escalate, a terrifying confrontation with the woman's husband and his own dark past looms, threatening to trap Laura in a nightmare from which she may never awaken.