In the remote village of Pé da Serra in the mountains of Portugal, a monk arrives wielding a demonic sword. Before long, the mystical weapon ends up in the hands of the town drunk António da Luz (who plays himself). Together, the drunkard and the sword will have to learn together to fight the encroaching evil.

At the peak of Summer, in a realm where circuits intertwine with consciousness, Martha and David question whether a menacing algorithm conceals the whispers of spirits, blurring the boundaries between technology and ethereal existence.