In the episode, a team called Torchwood split into two groups to go to Shanghai and Buenos Aires where the mysterious "Blessing" linked with the "Miracle" where nobody dies exists simultaneously.
An economic disaster has affected the world and governments have become more isolationist, and closer to dictatorships, and have started enforcing rationing.
Torchwood discover that Jilly Kitzinger was hired by PhiCorp to mistranslate foreign news clips into English, including one of a man in Shanghai saying he was saved by the Blessing.
Esther notes blood banks were burnt down shortly before the Miracle in two of the most populous cities in the world: Shanghai and Buenos Aires.
They decide to split up and investigate: Rex and Esther travel to Buenos Aires; Jack, Gwen, and Oswald (who knows too much information to be released and who is at risk of being murdered by Rhys if he stays in the Cooper residence) are smuggled by gun runners into Shanghai.
She is taken to the Blessing, which is revealed to be a massive crack or fissure running through the centre of the planet Earth, one that pulls the surrounding debris into itself.
Yet it was engaging with subtle satire threaded in, there were mentions of the economic turmoil caused by the Miracle which parallel the turbulent state of our own economy.
[3] The Guardian's Dan Martin states that the pretitle sequence "recalls some of the funny, quirky Welshness from the old days" whilst the story arc of Gwen losing her Dad is "genuinely heartbreaking."