Haunted Harmony Mysteries: Key to the Castle
This week on Girls Gone Hallmark, we’re reviewing Haunted Harmony Mysteries: Key to the Castle and once again asking ourselves if Eamon is secretly the star of this franchise. We discuss the murder of a paranormal TV host, a surprisingly clever mystery, and why we’re becoming far more invested in ghost friendships than romantic subplots. Plus, we share our thoughts on the future of the series, the emotional side of helping spirits cross over, and the buddy-cop franchise Hallmark doesn’t know it should be making.
Haunted Harmony Mysteries: Key to the Castle premiered on Saturday, May 30, 2026, on Hallmark Channel (and is available to stream on Hallmark+ the following day). Learn more about how to get Hallmark+ for free with a library card.
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How Many Movies are in the Haunted Harmony Mysteries Franchise on Hallmark?
As of June 2026, Hallmark has released three movies in the Haunted Harmony Mysteries franchise. The series stars Tamera Mowry-Housley as Gethsemane Brown, a music teacher living in Ireland who has the unique ability to communicate with ghosts. The films include Haunted Harmony Mysteries: Murder in G Major, Haunted Harmony Mysteries: Buried at C, and Haunted Harmony Mysteries: Key to the Castle. Based on the popular Gethsemane Brown mystery novels by Alexia Gordon, the franchise has become a fan favorite thanks to its blend of cozy mystery, Irish charm, and the unforgettable friendship between Gethsemane and her ghostly companion, Eamon.
Listen to Girls Gone Hallmark’s Review of Haunted Harmony Mysteries: Key to the Castle
The Cast of Haunted Harmony Mysteries: Key to the Castle
- Kraig Wenman penned the script for Key to the Castle, marking his third screenplay in the Haunted Harmony Mysteries franchise. All three films are adapted from novels by Alexia Gordon.
- Linda-Lisa Hayter directed Key to the Castle, her third Haunted Harmony Mysteries film. She also directed Tamera Mowry-Housley in Tidings for the Season.
- Speaking of Tamera Mowry-Housely…this marks her 44th acting credit and we last saw her in the recent All’s Fair in Love & Mahjong.
- Risteard Cooper returns as Eamon, Adam Fergus as Inspector O’Reilly, and Marco Grazzini as Griff.
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