Three boys are investigating a known
haunted house, Terror Castle, in hopes that perhaps
Alfred Hitchcockwould use it in his upcoming movie. Having just launched their
investigation firm, the Three Investigators are hoping for a triumphant
success to gain publicity and build their credibility. They briefly
gain an audience with the skeptical Hitchcock, who is dismissive but
agrees to introduce their case if they indeed were to demonstrate that
the castle was truly haunted.
Terror Castle is the former home of movie actor Stephen Terrill, who
died in a possibly suicidal car accident when his career was on the
verge of collapse. Terrill pledged to haunt his former home to keep
anyone else from living there. During their investigations, the boys
find very scary and seemingly real activities going on in the abandoned
structure, such as the Fog of Fear and the Blue Phantom.