This mission starts automatically after you defeat Nigel Cass, that is after you complete mission "London's Protectors".
The resistance has grown stronger, taken out some major factions oppressing London and made huge steps towards liberating the city.
It's time for DedSec and their allies to celebrate a hard-earned victory. And...wait. Why is Malik laughing?
Return to your safe house and talk to Hamish, Kaitlin and Nowt.
The next person you should talk to is Richard Malik.
When you are done talking to Malik then Bagley will want to talk to you. When you do so, he will inform you that your internal network has been breached.
After a while it will turn out that Zero-Day himself is responsible for that.
Simply leave the safe house and then this mission will end and you will receive another one.
