Ruth Sims, a.k.a. Gran, is a 65-year-old woman who lives and works at the Garingal Juvenile Justice Centre for Boys. Gran has been employed at Garingal for 25 years as a Prison Officer. She lives with her her co-worker Penny, known by the inmates as "Legs" due to her extreme height. Gran takes pride in looking after the "worst boys in the state" and can be as tough as she is kind to them. Her methods of looking after the boys are unorthodox, but tolerated amongst the prison hierarchy because they are successful.