This is the gripping real-life story of twin brothers and doctors Chris and Xand van Tulleken as they deal with everything the COVID-19 pandemic can throw at them. Dr Chris van Tulleken is on the Infectious Diseases Team at the world-leading UCL Hospital in London. He’s returning to the medical frontline for the first time in ten years to work on the COVID wards. As well as treating patients, he wants to try and understand what the virus is doing to our bodies and how it works. To make things more stressful for Chris, his wife Dinah is seven months pregnant with their second child. Chris’s twin brother, Dr Xand van Tulleken, is a public health expert. Xand has worked in medical emergencies around the world, but never so close to home. He wants to examine the impact COVID-19 is having outside our hospitals - on the UK’s most vulnerable - and lend a hand where he can.