Five Nights at Freddy's: Book Five: The Return of the Torment

In Five Nights at Freddy's: Book Five: The Return of the Torment, William Afton, believing he has escaped his past torment after the destruction of his home, is living in isolation. However, his peace is short-lived as he begins to experience strange occurrences, such as objects moving without explanation and whispers that haunt his every step. Unknown to him, Cassidy, the vengeful spirit who possesses Golden Freddy, has been quietly gathering power, waiting for the perfect moment to strike. As Cassidy manifests in his dreams and begins manipulating his reality, William's life unravels as he faces a relentless onslaught of nightmarish visions and encounters with the reanimated animatronics he once created, now twisted by Cassidy's fury.
As Cassidy's torment intensifies, William's sanity begins to break down. His guilt over the children he murdered and the suffering he caused is exacerbated by Cassidy's powerful presence, forcing him to confront the truth of his sins. Cassidy's haunting grows more personal as she forces William to relive the darkest moments of his past, including the locations where he committed his crimes. The final confrontation between William and Cassidy takes place in a distorted version of Freddy Fazbear's Pizza, where William must come to terms with his actions and face the eternal punishment Cassidy has become. The story ends with William's fate sealed, as Cassidy's unyielding vengeance ensures that he will never escape the cycle of torment he created, marking his existence as one of perpetual suffering.