Written by Francisco Feliciano, libretto by Fides Cuyugan-Asensio, based on a novel ascribed to Jose Burgos of the GOMBURZA; narrates the story of Governor-General Francisco Bustamante, his assassination, and the vengeance of his wife, Luisa - the La Loba Negra; music contains thrilling contrasts in pitch and orchestration, fast-changing meters and keys, and rich instrument timbres, presenting creepy wolf calls and nightly forest sounds