Samantha (government woman) came knocking asking for everyone's details but brought the mad man with a gun from the store (confrontation a few weeks before) who is now working for her.
They brought Bob in (the one Sarah left to die) and said her punishment was they were taking her back to care for him.
Sarah ratted Anya out as being a doctor and said they should take her instead as she could care for Bob properly and for others so they took Anya but the men went to get her back.
They got her and left Tom behind who then killed one of the men.
The group decided they should leave but before they do Najid runs away into the city. They group go after him as Samantha hears about the killing and sends the mad man out to hunt them down.
Najid finds his family gone then runs into a group of lads who are being "looked after" by a man and lady who send them out stealing and only reward them if they bring back decent things.
They take Najid in but his new friend becomes ill and isn't seen as pulling his weight and the man and woman discuss getting rid of him. Najid sees him being take in the middle of the night and tried to leave the next day but is kept with the man who takes Najid to his own home to get stuff.
Al is there (left by the others overnight while they looked elsewhere) and rescues Najid.
The others along with the mad man are watching a helicopter (various shots of it flying overhead and taking photos of people linked back to the lab shown in previous episodes where they have decided to go after Abby as she recovered from the virus).
The helicoper lands by the group, Greg gets shot and Abby is taken away in the helicoper and it ends.
I think that's about it.