Darren uncovers why Scotland has the highest drug-related death rate in Europe. He begins his journey on the front line of the drug crisis by spending a shift with the ambulance service during a busy Friday evening in Glasgow. He then travels to Fife, where he is trained to use Naloxone, a life-saving treatment that reverses the effects of an opioid overdose, and meets Reece who has been saved by the treatment twice.