Fear Street Part Three: 1666

Sarah Fier was accused of witchcraft primarily because Caleb accused her and Hannah of practicing witchery during a town meeting. The timing was critical, the town's food and water supplies had been poisoned, and Pastor Cyrus Miller had just committed mass murder of twelve children in the chapel. The townspeople needed someone to blame for the chaos, and Caleb's accusation, combined with Sarah's association with the mysterious widow's berries and the black magic book she had discovered, made her a convenient target for their fear and suspicion.

Earlier in the film, Sarah discovers a book of black magic during her quest for berries, which becomes used as evidence against her.

Solomon Goode made a deal with the devil, using the cursed black magic book he obtained from the mysterious widow to gain supernatural power. He was infatuated with Sarah Fier and attempted to force her into a relationship with him. When Sarah rejected him and discovered his dark pact, a struggle ensued during which she lost her hand. After capturing Sarah and Hannah for execution, Solomon became the architect of the Goode family's centuries-long curse, passing his powers to the firstborn of each generation.

Sarah confides in Solomon earlier, questioning whether she might be causing the town's misfortunes, not knowing he was the true source of the evil.

Sarah Fier was executed for witchcraft she did not commit. After being captured alongside Hannah, Sarah made a pivotal sacrifice by declaring herself the witch and vowing revenge against Solomon, taking the blame to save Hannah from execution. She was hanged for this crime, though the film shows her friends, Lizzie, Isaac, Hannah, and Abigail, mourn her death and give her a proper burial in the Union cemetery.

Sarah's declaration of revenge against Solomon as she faces execution hints at the curse she will unleash.

The Goode family curse originates from Solomon Goode's deal with the devil. Each firstborn of the Goode family inherits his powers and must perform sinister rituals to maintain their status and power. This creates a cycle where the Goode family perpetuates the Shadyside curse across generations, blighting Shadyside residents while benefiting Sunnyvale. The curse is tied to the firstborn inheritance, meaning each generation's eldest son is destined to continue Solomon's dark legacy.

Deena uncovers that the Goode family's power comes from their ancestral rituals, explaining why certain families prosper while Shadyside suffers.

The curse was broken when Deena killed Sheriff Nick Goode, the current inheritor of the family's dark powers. The group lured Nick to the Shadyside Mall using Deena's blood as bait, causing the killers to turn on him instead of their intended victims. In the tunnels beneath the mall, Deena confronted Nick, overcame his attempts to possess Sam, and delivered the fatal blow. With Nick's death, the curse's hold on Shadyside was shattered, allowing Deena and Sam to reunite and the town's nightmare to end.

The group specifically targeted Nick believing his death would break the curse, based on Deena's discovery of the Goode family's secret.

Pastor Cyrus Miller was possessed or corrupted by the same dark forces Solomon Goode had unleashed. After the town's food and water were poisoned, Pastor Miller began exhibiting disturbing, erratic behavior. He ultimately murdered twelve children, including Henry (Sarah's brother), inside the Union chapel. This atrocity was part of the spreading corruption that Solomon's deal had brought upon the town, though the exact mechanism of Pastor Miller's corruption is not fully detailed in the film.

The disturbing news of poisoned supplies and Pastor Miller's strange behavior precedes the chapel massacre.

Sam was possessed by one of the killer witches or the curse's malevolent force while in the tunnels beneath the Shadyside Mall. During the climactic confrontation, Deena pursued Nick Goode into the tunnels and faced a perilous fight against the possessed Sam. Deena managed to wrest Sam from the grip of possession, saving her before dealing with Nick and ending the curse.

The curse's power manifests through various hosts, and the mall's tunnels serve as a convergence point for the supernatural events.

Deena experienced a vivid vision of 1666 when she reassembled the severed hand of Sarah Fier. The hand, a relic from Sarah's execution, served as a supernatural conduit that transported Deena back through time, allowing her to experience the pivotal events of Sarah's life from her perspective. This vision provided Deena with the crucial knowledge about Solomon Goode's true role in creating the curse and the real history behind Shadyside's suffering.

The reassembling of Sarah's severed hand triggers the supernatural time-travel-like vision that drives the film's narrative.

The cursed book was a tome of black magic that Sarah Fier discovered during her quest to collect powerful berries from a mysterious widow. This book contained dark rituals and incantations that Solomon Goode later obtained and used to make his deal with the devil, gaining supernatural powers. The book is the source of the Goode family's curse and is later recovered by an unnamed figure in the post-credits scene, hinting at potential future threats.

Sarah's discovery of the black magic book foreshadows its central role in the curse's origin.

The post-credits scene reveals that an unnamed figure recovers the cursed book from the shadows of the tunnels beneath Shadyside. This unsettling moment suggests that the evil represented by the book has not been fully eradicated and may resurface in the future, establishing narrative potential for additional stories in the Fear Street universe.

The recovery of the book mirrors Solomon's original acquisition of the dark tome, suggesting a cyclical pattern of corruption.