Paul meets charming four-year-old Lucy, who has travelled down from Glasgow for the latest check-up to monitor her pulmonary hypertension - a high blood pressure condition that affects the lungs. He also meets remarkable 13-year-old Connor, who is on the isolation ward as he prepares for a bone marrow transplant to help treat leukaemia. As Connor needs to live in a totally sterile environment to protect his weakened immune system, Paul can only speak to him through a window - but that doesn't stop him finding a number of fun and interesting ways to keep Connor occupied during his recovery.