Brandt believes his move to Shadyside will be a fresh start, but he is unaware of the dark history of his new home, 99 Fear Street. He is oblivious to the spectral occurrences and gruesome legends associated with the house, including tales of headless bodies and bleeding walls. His ignorance is further compounded by the presence of Cally Frasier, a vengeful spirit who continues to inhabit the house and plots horrific fates for Brandt and anyone who gets close to him.

The premise sets up a classic haunted house narrative with a supernatural antagonist. The focus on a new resident's ignorance of the house's dark past and the vengeful spirit Cally Frasier suggests a story driven by suspense and escalating terror. The Fear Street series is known for its teen-centric horror, implying a narrative that will explore the protagonist's struggle against forces beyond his comprehension. The trilogy format suggests a developing plot that may escalate in intensity across multiple installments.