Naman Shrestha
With Ali Liebert at the helm, Hallmark’s ‘Haunted Harmony Mysteries: Key to the Castle’ reintroduces us to the former orchestra conductor, Gethsemane Brown, as she finds herself in the middle of a new murder mystery. Excited about the upcoming ghost hunter show in the town’s castle, the locals are shocked when the host of the show is murdered. Given her experience solving homicides, Gethsemane takes responsibility for the ensuing investigation, receiving support from her ghost friend, Eamon. As the music teacher digs deeper, she uncovers some dark, buried secrets of the castle. The murder mystery thriller movie is set primarily in and around the castle, which serves as an additional character that harbors shocking truths beneath its unassuming exterior.
Where Was Haunted Harmony Mysteries: Key to the Castle Filmed?
The visual canvas of ‘Haunted Harmony Mysteries: Key to the Castle’ features the locales of Ireland, especially Dublin and the surrounding areas. From what we can tell, the shooting process commenced in September 2025 and lasted a few weeks before wrapping up in October of the same year. One of the crew members, Debbie O’Donnell, took to social media and expressed her gratitude for being a part of the production. “That’s a wrap 🎬. It was an absolute pleasure working with this amazing group of people for the last few weeks especially @tameramowrytwo who is one of the hardest working people I know (to say we had a few laughs along the way is an understatement 😉). A special shout-out to @edwinaforkin for having me as part of your crew,” she wrote.
Dublin, Ireland
Following the pattern of previous installments, the production team of ‘Haunted Harmony Mysteries: Key to the Castle’ utilized the picturesque and lush green landscapes of Dublin, the capital of Ireland. They traveled across the city to tape various indoor and outdoor portions for the whodunnit film. The lighthouses located in and around the outskirts of the city also feature in the backdrop of numerous exterior shots.
As for the scenes involving the castle, where the ghost hunter show is scheduled to take place, they were reportedly taped at Drimnagh Medieval Castle and Gardens, a real-life castle located on Long Mile Road in the suburb of Drimnagh. Serving as a cherished heritage site, the castle also offers guided tours for visitors who wish to explore the castle and its enchanting gardens and learn about its rich history. Besides being a filming destination, it can also be booked for product launches, photo shoots, and school projects. To tape additional portions for ‘Haunted Harmony Mysteries: Key to the Castle,’ the cast and crew also seemingly set up camp in Blessington, a town located a few miles southwest of Dublin.
Haunted Harmony Mysteries: Key to the Castle Cast Details
Tamera Mowry-Housley, Marco Grazzini, and Risteard Cooper are the driving forces that bring the mysterious narrative of ‘Haunted Harmony Mysteries: Key to the Castle’ to life. The three have previously collaborated in the previous installments of the ‘Haunted Harmony Mysteries’ film series, allowing them to work together more smoothly.
Tamera Mowry-Housley as Gethsemane Brown
Tamera Mowry-Housley portrays Gethsemane Brown, a former music teacher who investigates the mystery, in ‘Haunted Harmony Mysteries: Key to the Castle.’ Widely known for her portrayals of Sissy in ‘The Hot Chick,’ Young Cat in ‘Seventeen Again,’ Camryn Barnes in ‘Twitches Too,’ and Tamera Campbell in ‘Sister, Sister.’ She has showcased her acting prowess in various other film and TV projects, including ‘All’s Fair in Love and Mahjong,’ ‘Inventing the Christmas Prince,’ ‘Tidings for the Season,’ ‘RJ Decker,’ ‘Things We Do for Love,’ and ‘Melissa & Joey.’
Marco Grazzini as Griff
In the Hallmark whodunnit, Marco Grazzini steps into the role of Griff. You might find his face familiar because he portrays Mike Valenzuela in ‘Virgin River,’ Luke in ‘Christmas Under the Lights,’ and Alex in ‘Betty’s Bad Luck in Love.’ His TV credits include the likes of ‘Kim’s Convenience,’ ‘Watson,’ ‘The Murders,’ ‘A Series of Unfortunate Events,’ and ‘The Art of More.’
Risteard Cooper as Eamon
Risteard Cooper dons the garb of Eamon, Gethsemane’s ghost friend, in ‘Haunted Harmony Mysteries: Key to the Castle.’ The Irish actor, comedian, and writer is known for featuring in ‘No Offence’ as Laurie Gaskell, ‘Quiz’ as David Liddiment, ‘Extra Ordinary’ as Vincent Dooley, and ‘Apres Match’ as an Actor. He also stars in other TV shows, such as ‘Delicious,’ ‘Acceptable Risk,’ ‘The Power,’ ‘Too Close,’ ‘The Inheritance,’ and ‘The Suspicions of Mr. Whicher.’
Other talented actors who play supporting yet critical roles in the Hallmark production are Julie Lamberton as Siobhan, Adam Fergus as Inspector O’Reilly, Sarah Gallagher as Ciara Gordon, Ryan Murray as Zak, and Aidan Redmond as Ed James.
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