was due to a faulty computer system called horizon. she's come back here today for the first time in 20 years, in the hope that this will somehow help with her recovery. this is my cell. this is your cell? yeah, that's my bed. i remember saying to a girl, i hadn't done the crime. and she said, oh, none of us have. see... you couldn't even protest your innocence in here. i never thought i could come here, ever. tracy spent several weeks in this group cell, before being moved to one of her own. this was my cell, cell 21. it's now 20 years since you were in this prison. how has your life changed by being here? although it's made me