Formerly a rich Venetian woman, the woman with slimed-green hair finds all her possessions appropriated by Napoleon Bonaparte after the French army conquers Venice in 1797. The woman goes into internal exile in the secret inner canals of Venice wearing her old curtains. At some point, phosphorescent slime occupies her hair, turning it green. Villanelle first encounters the woman with slimed-green hair as a teenager exploring Venice’s canals by boat. When she returns to Venice with Henri years later, she takes him to visit the woman with slimed-green hair, who warns him to “beware of old enemies in new disguises”—foreshadowing the French army cook’s reappearance as Villanelle’s abusive husband.