Spirit Lake is unusually deep. No diver has ever managed to find the bottom, though many have tried. When Dr. Amelia Brooks disappears during a deep-water dive, her three daughters travel home to settle her affairs. They find themselves unable to let go of their mother and become drawn into the mysteries of the lake. Spirit Lake is unusually deep. No diver has ever managed to find the bottom, though many have tried. When Dr. Amelia Brooks disappears during a deep-water dive, her three daughters travel home to settle her affairs. They find themselves unable to let go of their mother and become drawn into the mysteries of the lake. Parental Guide