This episode explores the chances that people take in life and whether a gamble ever pays off. Megan, who's 20, is rushed to St George's after being involved in a high-speed car crash. As doctors work to assess her injuries, it becomes clear how her hedonistic lifestyle has put her at risk. James, who's 78, is transferred from his local hospital with suspected internal bleeding. And 40-year-old Jibraeel has lodged a cotton bud in his ear.