The episode opens with Jacks recollections of the events of 1965. We find out that the aliens offered a cure for a deadly new flu strain that will soon arise, and in return wanted 12 children. Jacks partner (a woman) claims that the aliens said the children will live forever and he was requested as he cant die and doesn’t care.

We then see Clements attempted abduction, and that Jack was the one primarily responsible for handing the children over. It turns out that the reason Clement wasn’t taken was the 456 disappeared before they could take him, and Jack was unaware that Clement had escaped. The 456 did not seem to care as they handed over the cure data.

Back in the present Clement then steals Gwens gun and shoots Jack, after Gwen retrieves her gun from Clement, Jack wakes up and Clement runs off in a panic, but Gwen manages to calm him down. They later wonder why Clem wasn’t taken but speculate that perhaps he was on the verge of puberty and so not wanted by the 456.

At Johnsons facility, Alice and Steven are imprisoned, and Alice warns Johnson about angering Jack.

Back at the home office, Frobisher, asks what would happen to the children, and the “456” by responding that a “Remnant” is watching, and then says it is off the record. It then invites Frobisher in with a camera.

A cameraman enters, and we see a profile of the 456. Decker then says he is detecting 3 heartbeats and that there are 3 distinct types of life in there. We then see a child hooked up to something.

As the cameraman leaves, a recording of Frobishers voice saying it is off the record is played, the 456 then says they do not harm the children and they feel no pain. The 456 then say if humanity refuse to hand over the children they will wipe out their entire species.

The Americans then demand all the records of 1965 from the PM, and threaten him, with UN sanctions of some sort for withholding the information.

Back with Jack, he and Ianto argue, and Jack eventually leaves and says he will call Frobisher, and tells Ianto that Frobisher has his children. He calls Frobisher and makes it look like he has worked out what the 456 want, and threatens to go public.

There is then a Cobra meeting, which Lois attends. The PM then says they will try to haggle, but they cant take military action as there isn’t anything to target. The PM and Frobisher then talk about camouflagable targets but no more. At one point in the meeting Bridget looks at Lois with suspicion. The PM then tells Frobisher to offer 60 Units” and no more.

Back at the 456 “embassy” Frobisher offers the 456 1 child per million people on Earth, the 456 refuse and Frobisher then gives them time to consider say 325 000, which the children start chanting. Unlike the initial chanting children in each country are saying a different number, which is 10% of the total children in each country.

Back at Johnsons facility, it turns out that she is being kept in the dark and decides to go into London, but keeps her team on the lookout for Jack.

At the Cobra meeting, they discuss how to select the 10%. One of the cabinet members Denise, then proposes that they select on the basis of intellect and social status, using the school league tables. This proposal is accepted and given to Frobisher as his 10% to give to the 456.

The Torchwood team then realise that Lois footage will give the Torchwood team enough to blackmail all of the cabinet, and force there way into Thames house. Ianto then phones his sister to warn her even knowing that the line is tapped and also asks the people monitoring them to protect their children, they give his position to Johnson anyway.

A little later Johnson arrives, and they work out where the Team where hiding. In a Cobra meeting, Frobisher proposes a false vaccination that will “go wrong” allowing them to put the blame on the 456. Lois then speaks up and admits working for Torchwood, and recording the footage and blackmails them.

Johnson arrives a the Torchwood Hub, but Gwen was expecting them, and shows them what they were recording. Rhys has gone into hiding and is ready to send out the footage the second something goes wrong.

While Jack talks to the 456, they seem convinced he will yield again. Jack says he is making it a war, then the 456 says the fight begins. The 456 then say they have released a virus into the building that will kill everyone. Ianto and Jack shoot at the 456 chamber, but the bullets bounce off. Jack says he will get Ianto out, but he says its too late and collapses.

The 456 then start to shriek which causes Clement to scream in agony and start bleading, the 456 then say the Remnant will be disconnected and Clement dies in Gwen’s arms

We then see everyone in Thames house collapsing and dying aside from Decker who gets into an environmental suit in time, we then see Ianto die in Jacks arms. The 456 then tell Jack that he will die and tomorrow the children will be delivered. Jack then succumbs to the virus himself.

Back at the cabinet, the Cabinet then wonder what to do next, and decide to go ahead with delivering the children. We then see Gwen collect Jack and Ianto’s bodies, Jack then wakes up and comforts a distraught Gwen who says there is nothing we can do.