Glasgow, 2025. Dr Amanda Maclean is called to treat a young man with a mild fever. Within three hours he dies. The mysterious illness sweeps through the hospital with deadly speed. This is how it begins. The victims are all men. Dr Maclean raises the alarm, but the sickness spreads to every corner of the globe. Threatening families. Governments. Countries. Can they find a cure before it's too late? Will this be the story of the end of the world - or its salvation?