The Three Investigators in The Secret of Terror Castle (Alfred Hitchcock and The Three Investigators #1)

The Three Investigators search for an authentic haunted house - Finding a genuine haunted house for a movie set sounds like fun -- and a great way to generate publicity for the Three Investigators' new detective agency. But when the boys arrive for an overnight visit at Terror Castle -- home of a deceased horror-movie actor -- they soon find out how the place got its name!
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https://en.wikipedia.org/wiki/The_Secret_of_Terror_Castle
https://en.wikipedia.org/wiki/Three_Investigators
https://en.wikipedia.org/wiki/The_American_series_of_The_Three_Investigators#Crimebusters_(1989–1990)

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