The focus is on three special units within high-security prisons in light of an assault by Hashem Abedi against staff members. HMP Frankland, often referred to as “Monster Mansion” due to its grim appearance, has housed notorious inmates since its opening in 1983, including Peter Sutcliffe, Harold Shipman, and Charles Bronson. Located near a historic priory in Durham, the prison’s harsh exterior reflects the serious nature of the offenses committed by its residents.