The Mrs Bradley Mysteries (1998)

S1E2 Death at the Opera

Title: Tragedy at the Opera Plot: Mrs. Bradley makes a visit to her former school to deliver the esteemed Evadne Flint Lecture, but the event takes a dark turn when the music instructor is discovered lifeless amid a performance of The Mikado. Determined to get to the bottom of the mystery, Mrs. Bradley delves into the tangled web of resentments, thefts, a hidden child, and several secret romances that cloud the school's atmosphere.