In a remote mansion by the shores of a dark lake, a group of friends gathers to attend a disturbing séance organized by the enigmatic Dr. George D. Cummings. As tensions rise, a series of mysterious murders break out in the area, and the friends begin to question the existence of local legends claiming that a monster lurks in the night.
The atmosphere becomes even more terrifying when they discover that the victims are linked to an ancient curse and the tragic history of the mansion, where years ago a brilliant inventor vanished without a trace. With time running against them, the group unravels dark secrets and personal conflicts, leading to an overwhelming sense of distrust among them. As shadows come to life, they begin to suspect that the culprit is not just a monster, but that there is a hidden killer among them.
With the sky overcast and the echo of the storm resonating, tensions reach their peak. On a night filled with unexpected twists, old grudges, and palpable terror, each must confront their own demons while trying to survive. Will they survive the horrors that lurk in the darkness, or will they become the next victims of an evil they cannot comprehend? Madness and mystery intertwine in a frantic search for the truth.