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 | Maureen Hughes | Casting |
| Writing | Alexia Gordon | Book |
| Costume & Make-Up | Gemma Keenan | Costume Designer |
| Production | Scott Clayton | Supervising Producer |
| Production | Joel S. Rice | Executive Producer |
| Production | Michael Prupas | Executive Producer |
| Sound | Jeff Tymoschuk | Music |
| Production | Edwina Forkin | Producer |
| Production | Tamera Mowry-Housley | Executive Producer |
| Production | Lyndzi Doyle | Line Producer |
| Writing | Kraig Wenman | Writer |
| Camera | Ciarán Tanham | Director of Photography |
| Production | Charles Cooper | Producer |
| Production | David Collins | Executive Producer |
| Art | Padraig O'Neill | Production Design |
| Production | Alison Crosbie | Casting |
| Production | Nikki Terpilowski | Associate Producer |
| Editing | Braden Oberson | Editor |
| Directing | Marie Boylan | Second Assistant Director |
| Crew | Aran Condren | Armorer |
| Art | Paul Brady | Graphic Designer |
| Directing | Brian 'Joker' Mulvey | First Assistant Director |
| Camera | Steffan Hill | Still Photographer |
| Production | Manus Hingerty | Location Manager |
| Camera | Caoimhe Hernon | Second Assistant Camera |
| Camera | Conor Kelly | First Assistant Camera |
| Camera | Ger O'Keefe | Second Assistant Camera |
| Art | Andrea Hobbs | Assistant Art Director |
| Production | Lisa O'Malley | Location Assistant |
| Camera | Brendan Comerford | Camera Trainee |
| Camera | Rossa O'Dowd | Digital Imaging Technician |
| Art | Brid Ni Luasaigh | Standby Art Director |
| Camera | Philip McKeon | Camera Operator |
| Camera | Craig Porter | Camera Operator |
| Directing | Ally O'Toole | Script Supervisor |
| Crew | Joe Condren | Stunt Coordinator |
| Art | Jesse Reid | Assistant Art Director |
| Crew | Sean Condren | Stunt Coordinator |
| Camera | John McCarthy | First Assistant Camera |
| Camera | Ruairi O Hoisin | Camera Trainee |
| Camera | Ailis Cross-Gorman | Camera Trainee |
| Art | Joe Doherty | Art Direction |
| Art | Martin Carey | Property Master |
| Costume & Make-Up | Roisin Ni Ghabhann | Costume Standby |
| Directing | Emily Roche | Third Assistant Director |
| Costume & Make-Up | Frances Galligan | Makeup Trainee |
| Production | Lia Caira | Assistant Production Coordinator |
| Sound | Alex Macia | Foley Artist |
| Lighting | Kieran Dempsey | Best Boy Electric |
| Camera | Aidan Griffin | Key Grip |
| Production | Laura Quinn | Casting Assistant |
| Production | Jeswin Jose | Assistant Accountant |
| Production | Alison Rainsford | Casting Assistant |
| Production | Salvatore Sirignano | Assistant Accountant |
| Visual Effects | Kevin Byrne | Special Effects Supervisor |
| Production | Stephen McGillen | Production Accountant |
| Sound | Karl Merren | Sound Mixer |
| Sound | Trevor McKenna | Sound Mixer |
| Costume & Make-Up | Madonna Bambino | Makeup Designer |
| Production | Lenka Blundell | Production Accountant |
| Costume & Make-Up | Madonna Bambino | Hair Designer |
| Costume & Make-Up | Roisin Condon | Makeup & Hair Assistant |
| Sound | Devon Quelch | Foley Artist |
| Costume & Make-Up | Chloe Lyons | Costume Supervisor |
| Sound | Niall O'Sullivan | Production Sound Mixer |
| Production | Lindsay Campbell | Production Coordinator |
| Crew | Liam Neville | Transportation Coordinator |
| Lighting | Noel Cullen | Gaffer |
| Sound | Jeff Grout | ADR Mixer |
| Sound | Miguel Nunes | Sound Re-Recording Mixer |
| Sound | Siân O'Byrne | Music Supervisor |
| Production | Moheb Jindran | Post Production Coordinator |
| Editing | Rick Mabey | Online Editor |
| Editing | Kipp Lightburn | Colorist |
| Sound | Miguel Nunes | Sound Supervisor |
| Sound | Craig George | Sound Effects Editor |
| Sound | Matias Gibbs | Foley Editor |
| Production | Stepanka Silna | Post Production Coordinator |
| Editing | Veronica Formos | Assistant Editor |
| Crew | Sepideh Merchant | Post Production Supervisor |
| Sound | Andrea Velarde Mosquera | Dialogue Editor |
| Sound | Hollie Sanders | Music Coordinator |
| Sound | Craig George | Sound Designer |
| Visual Effects | Brian Rossney | Visual Effects Supervisor |
| Visual Effects | Vishwas Kapoor | Visual Effects Supervisor |
| Editing | Marvin Amin | Online Editor |
