Five years after its triumphant premiere in Aix-en-Provence, in 2021, Kaija Saariaho’s Innocence casts anchor at the Metropolitan Opera, with the original Simon Stone production intact. Beginning at a wedding in the present, the action spirals back to a school shooting 10 years earlier. No end of ghastly secrets unravel. Haven’t we seen this movie before? (Remember Thomas Vinterberg’s Festen, the source of Mark-Anthony Turnage’s opera of the same name?) Yet critics have ranked Innocence with such iconic horror shows as Elektra (1909) and Wozzeck (1925); don’t say you haven’t been warned. Joyce DiDonato slums as the Waitress, who knows stuff. The otherworldly folk singer Vilma Jää, who has been with the production from the start, plays her daughter Markéta, who is not all there. —Matthew Gurewitsch