Former orchestra conductor Gethsemane Brown has moved to the Irish countryside to teach music at St. Brendan’s boarding school. After deciphering a cryptic musical message, she meets renowned composer Eamon McCarthy, who is rumored to be behind the death of his longtime love. Eamon enlists Gethsemane’s help to find the real person responsible so that he can finally move on and reunite with his true love in the afterlife. With the ghost of Eamon tagging along, Gethsemane investigates, but faces resistance from the charming Inspector O’Reilly, who takes a liking to her but considers the case closed. Juggling her sleuthing with the job she was hired to do, Gethsemane meanwhile struggles to turn the motley crew of students at St. Brendan’s into a choir that can compete at Regionals, though a handsome math teacher Griff is able to help her gain some ground.
Unfortunately the movie Haunted Harmony Mysteries: Murder in G Major is not yet available on HBO Max.
| Directing | Linda-Lisa Hayter | Director |
| Production | Charles Cooper | Producer |
| Production | Maureen Hughes | Casting |
| Costume & Make-Up | Gemma Keenan | Costume Designer |
| Production | Michael Prupas | Executive Producer |
| Production | Nikki Terpilowski | Associate Producer |
| Camera | Ciarán Tanham | Director of Photography |
| Production | Edwina Forkin | Producer |
| Production | Lyndzi Doyle | Line Producer |
| Production | Scott Clayton | Supervising Producer |
| Editing | Braden Oberson | Editor |
| Writing | Alexia Gordon | Book |
| Production | Tamera Mowry-Housley | Executive Producer |
| Writing | Kraig Wenman | Writer |
| Production | Alison Crosbie | Casting |
| Art | Padraig O'Neill | Production Design |
| Production | David Collins | Executive Producer |
| Sound | Jeff Tymoschuk | Music |
| Production | Joel S. Rice | Executive Producer |
| Camera | Conor Kelly | First Assistant Camera |
| Camera | Ger O'Keefe | Second Assistant Camera |
| Camera | Brendan Comerford | Camera Trainee |
| Art | Andrea Hobbs | Assistant Art Director |
| Art | Brid Ni Luasaigh | Standby Art Director |
| Directing | Marie Boylan | Second Assistant Director |
| Production | Manus Hingerty | Location Manager |
| Camera | John McCarthy | First Assistant Camera |
| Crew | Sean Condren | Stunt Coordinator |
| Camera | Steffan Hill | Still Photographer |
| Directing | Brian 'Joker' Mulvey | First Assistant Director |
| Camera | Rossa O'Dowd | Digital Imaging Technician |
| Art | Paul Brady | Graphic Designer |
| Crew | Joe Condren | Stunt Coordinator |
| Production | Lisa O'Malley | Location Assistant |
| Camera | Philip McKeon | Camera Operator |
| Camera | Craig Porter | Camera Operator |
| Art | Jesse Reid | Assistant Art Director |
| Crew | Aran Condren | Armorer |
| Directing | Ally O'Toole | Script Supervisor |
| Art | Joe Doherty | Art Direction |
| Camera | Ruairi O Hoisin | Camera Trainee |
| Camera | Ailis Cross-Gorman | Camera Trainee |
| Camera | Caoimhe Hernon | Second Assistant Camera |
| Costume & Make-Up | Madonna Bambino | Hair Designer |
| Crew | Liam Neville | Transportation Coordinator |
| Costume & Make-Up | Roisin Condon | Makeup & Hair Assistant |
| Visual Effects | Kevin Byrne | Special Effects Supervisor |
| Sound | Matias Gibbs | Foley Editor |
| Production | Lenka Blundell | Production Accountant |
| Editing | Marvin Amin | Online Editor |
| Editing | Kipp Lightburn | Colorist |
| Sound | Jeff Grout | ADR Mixer |
| Sound | Sian O'Byrne | Music Supervisor |
| Sound | Niall O'Sullivan | Production Sound Mixer |
| Sound | Trevor McKenna | Sound Mixer |
| Costume & Make-Up | Roisin Ni Ghabhann | Costume Standby |
| Directing | Emily Roche | Third Assistant Director |
| Art | Martin Carey | Property Master |
| Costume & Make-Up | Frances Galligan | Makeup Trainee |
| Production | Jeswin Jose | Assistant Accountant |
| Production | Alison Rainsford | Casting Assistant |
| Sound | Craig George | Sound Designer |
| Lighting | Kieran Dempsey | Best Boy Electric |
| Camera | Aidan Griffin | Key Grip |
| Production | Laura Quinn | Casting Assistant |
| Sound | Miguel Nunes | Sound Supervisor |
| Costume & Make-Up | Chloe Lyons | Costume Supervisor |
| Lighting | Noel Cullen | Gaffer |
| Visual Effects | Brian Rossney | Visual Effects Supervisor |
| Costume & Make-Up | Madonna Bambino | Makeup Designer |
| Production | Lia Caira | Assistant Production Coordinator |
| Sound | Alex Macia | Foley Artist |
| Production | Lindsay Campbell | Production Coordinator |
| Production | Stephen McGillen | Production Accountant |
| Production | Salvatore Sirignano | Assistant Accountant |
| Sound | Karl Merren | Sound Mixer |
| Editing | Rick Mabey | Online Editor |
| Editing | Veronica Formos | Assistant Editor |
| Sound | Craig George | Sound Effects Editor |
| Production | Moheb Jindran | Post Production Coordinator |
| Sound | Andrea Velarde Mosquera | Dialogue Editor |
| Sound | Miguel Nunes | Sound Re-Recording Mixer |
| Production | Stepanka Silna | Post Production Coordinator |
| Sound | Devon Quelch | Foley Artist |
| Crew | Sepideh Merchant | Post Production Supervisor |
| Sound | Hollie Sanders | Music Coordinator |
| Visual Effects | Vishwas Kapoor | Visual Effects Supervisor |
