A new strain of bubonic plague is diagnosed in London. Before it can be contained it spreads through the population, faster and more deadly than anyone could have imagined. Three weeks is all it takes to decimate the country. Johnny tells Liz not to phone the NHS when their young son starts to show symptoms. But she ignores him and a few hours later the army arrives and boards them into their house. Now Nathan is dying and there is nothing they can do to help him. Hours pass like weeks as their little boy grows weaker and weaker. All Liz wants is that they die with some dignity but the authorities refuse to help. Then the broadband dies and the phones stop working. Cut off from the world and boarded into their house, the family try their best to cope. But there is nothing they can do to stop the plague.