Susan and her brother Johnny go to spend the summer with their aunt and uncle where they discover a map that may lead to some sort of treasure. Susan had been having nightmares about a girl (Rachel) who disappeared in a nearby mansion now old and abandoned. Eventually Susan and Johnny along with their cousin Billy begin a quest to find the treasure as well as the answers to Rachel's disappearance. While they are doing this 2 escaped convicts are also looking for the same treasure!
Unfortunately the movie Mystery Mansion is not yet available on HBO Max.
| Directing | David Jackson | Director |
| Writing | Jack Duggan | Screenplay |
| Writing | David Jackson | Screenplay |
| Writing | Arn Wihtol | Screenplay |
| Sound | William Loose | Original Music Composer |
| Editing | Stephen L. Johnson | Editor |
| Production | Arthur R. Dubs | Producer |
