Isis are back. In fact, to borrow Gerry Adams’s remark about the IRA, they never went away. Now, they are regaining some of their previous strength in Syria and Iraq, and moving into fresh territory in Africa. Of most importance to the West, the Afghan branch of Isis – Isis Khorasan – is said to be plotting more direct attacks on the ‘far enemy’, as well as pumping out propaganda to create so-called ‘lone wolves’.