Former orchestra conductor Gethsemane Brown relocates to the Irish countryside to take on a music teaching position at St. Brendan’s boarding school. Upon unraveling a mysterious musical clue, she encounters the famous composer Eamon McCarthy, who is suspected of causing the death of his beloved. Eamon seeks Gethsemane’s assistance to uncover the true culprit, hoping to find peace and reunite with his love in the afterlife. Accompanied by Eamon’s ghost, Gethsemane delves into the investigation, but faces opposition from the charming Inspector O’Reilly, who is fond of her yet believes the case is resolved. Balancing her detective work with her teaching duties, Gethsemane also strives to transform the diverse group of students at St. Brendan’s into a choir capable of competing at Regionals, with some support from the attractive math teacher, Griff.