Mystery! Action! Songs! Join Detectives Mary-Kate and Ashley as they undertake daring adventures. Pack your gear and help the Trenchcoat Twins investigate the danger that lurks. Along with their sidekick dog, Clue, Mary-Kate and Ashley promise to "solve any crime by dinner time." In this episode, the Olsen and Olsen Mystery Agency has been hired to find the ghost in a haunted mansion in Transylvania!
| Directing | Michael Kruzan | Director |
| Writing | Michael Kruzan | Writer |
| Writing | Charlotte Dreiman | Writer |
| Production | David Benjamin | Executive Producer |
| Production | Laurie Cohen | Producer |
| Production | Adria Later | Producer |
| Production | Michael Kruzan | Executive Producer |
| Production | Briana Wilson | Producer |
| Crew | Jerry Workman | Cinematography |
| Costume & Make-Up | Seok Halley Yoon | Costume Design |
| Costume & Make-Up | Kathryn Morrison | Costume Design |