"Calipso" is about a fungal epidemic based on a phenomenon that exists in the natural world. There is a parasitic fungus that changes the neurological system of its hosts, turning them into zombies.

Lost in the forest on a stormy night, Maria and Miguel take refuge in an old woodcutter’s home. The cottage seems to be the ideal scenario for all desires, hunger pangs, and spells to be released. But, apparently, the old woodcutter, with his strange habits, does not live alone.