Si King returns to the north east of England to retrace a period where the NHS was critical in saving his life. In 2014 he was diagnosed with a brain aneurysm and rushed to surgery. The procedure was known as an occlusion, and the aim was to relieve pressure on Si's brain and stop the bleeding. The vast majority of people who get such a diagnosis either die or suffer permanent disabilities, so when Si awoke afterwards with only confusion he was extremely lucky. So much so that he hasn't really looked back, instead choosing to get on with life in the years since. That has left him feeling that he hasn't taken time to properly reflect on what happened or to say thank you. Si returns to the emergency ward and the neurology department to meet patients who are going through what he went through and the staff who are helping them.