Production
The series is based on a 2018 article for New York's "The Cut" by Reeves Wiedeman, which chronicled the experience of Derek and Maria Broaddus after they received threatening letters upon moving into their home at 657 Boulevard in Westfield, New Jersey in 2014, which continued until they sold the home in 2019. The character John Graff was based on John List, a mass murderer and longtime fugitive who murdered his family in his Westfield home in 1971. Similarities between John Graff's character and the List murders include his career as an accountant, attending a Lutheran church, and murdering his family members and live-in mother, along with leaving music playing in the house and planning an alibi that would cause the bodies to remain undiscovered for several weeks.
On-location scenes for the home at 657 Boulevard were filmed at a private residence in Rye, New York that was built in 2016. The scenes where the Brannock family stays at a motel were filmed at an operating motel located in the hamlet of Locust Valley on Long Island, New York.
While no scenes were filmed at the real-life 657 Boulevard residence in Westfield, the neighborhood received increased attention from visitors and fans following the release of the series; the home was guarded by police and barricade tape to prevent trespassers in October 2022.
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