Bertha Mason - Rochester’s clandestine wife, Bertha Mason is a formerly beautiful and wealthy Creole woman who has become insane, violent, and bestial. She lives locked in a secret room on the third story of Thornfield and is guarded by Grace Poole, whose occasional bouts of inebriation sometimes enable Bertha to escape. Bertha eventually burns down Thornfield, plunging to her death in the flames.