Documentary following two cancer patients who have volunteered as test subjects for an experimental treatment. CAR T-cell therapy has been described as the first step towards a cure - but 53-year-old Graham and 18-year-old Mahmoud may never reap the benefits, as their role is to allow scientists to monitor the side effects. The film examines the relationship between the patients and the clinical team, and how age and life experience affects their physical and emotional response to the treatment.