[1] The film is said to be based on true life experiences.

Sean Stone and Alexander Wraith play filmmakers who meet at a dinner with Oliver Stone (Sean's real-life father) when Wall Street: Money Never Sleeps was being filmed in October 2009.

As a result, Sean and Alexander decide to visit an abandoned psychiatric hospital in New Jersey, famous for its radical treatment of patients with mental illness, 'to explore whether or not they believe in the supernatural'.

Greystone Park has received negative reviews from critics.

[citation needed] The working titles of the film were Graystone and SecretStone.