On September 11th 2001, the world experienced the first quakes of Islamicist nihilism and arbitrary violence. Three wars and various regional conflicts followed. No place on earth is safe from random terrorist attacks. Al-Qaeda guerrillas and satellite groups have killed thousands of civilians of every background. Most of the victims are Muslims. Isis, the most well organised Jihadi force, has swept through parts of the Middle East. In the last decade, western born Muslims have been drawn to the hard-line ideologues and their certainties. In 2016, three smart young British Bangladeshi schoolgirls from the east end of London ran away from home and ended up in Raqqa, Syria. One of them may have been killed in a bomb blast. There has been no other information about them. They vanished into a black hole. We all ask why; we all seek answers. Humza Arshad, a YouTube minor celeb who has many young Muslim fans, expresses the views of bewildered fellow citizens: ‘No one would ever have thought something like that could happen to them and it made me realise that if it can happen to families like that, it can happen to anyone.’ He thinks young people are being brainwashed online. (Financial Times, 18/10/16). So do the police, concerned Muslim organisations, politicians and intelligence agencies. Accumulating evidence confirms what is feared: real and virtual proselytisers are getting into young minds and turning them.