Why did v have to lock up evey and torture her?

In the narrative, V locked up and tortured Every as a means of extracting crucial information or gaining leverage. This action reflects V's desperation or moral conflict, illustrating the lengths to which one might go when faced with dire circumstances. The situation underscores themes of trust, betrayal, and the consequences of power dynamics in their relationship. Ultimately, it serves to heighten the tension in the story and explore the darker aspects of human nature.