In case anyone wants to find the book he co-wrote there is a link on the co authors site (https://www.libertyhumanrights.org.uk/liberty-team/silkie-carlo https:

In case anyone wants to find the book he co-wrote there is a link on the co authors site (https://www.libertyhumanrights.org.uk/liberty-team/silkie-carlo https://www.libertyhumanrights.org.uk/liberty-team/silkie-ca...) it is called Information Security for Journalists. I hope that he is ok and just decided to go off the grid as some of his friends speculate.