Once a year, every Saci Day, October 31st, also known as Halloween, the sacred book that brings together all the legends of Brazil is revealed. But on that date, other international mystical beings intend to steal the book and national legends and legends need to do something to stop them.

In Recife, a group of young researchers specializing in paranormal phenomena is hired by an enigmatic businessman to find the legendary treasure of Branca Dias. As they delve into the city's rich history in search of clues about the mysterious artifact, they find themselves entangled in a web of frightening secrets hidden in the capital of Pernambuco, putting their lives at risk as they try to unravel the hauntings that surround them.

A science fiction writer sees one of his tales come to life. The creature Zornit controls his mind, causing the boundaries between reality and fiction to diffuse.