The Secret of Terror Castle
 Three boys are investigating a known haunted house, Terror Castle, in hopes that perhaps Alfred Hitchcock would 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 are able to demonstrate that the castle is truly haunted. Terror Castle is the former home of movie actor Stephen Terrill, who has died in a possibly suicidal car accident that occurred as his career was on the verge of collapse. Terrill had 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.