“Every day, I reread what presumably would have been one of the last emails you sent that Sunday before they came for you and Mohamed and then Baher. In typical AJE style I was asking you about your next assignment even before you’d finished your current one.”

So begins a letter from the head of newsgathering in Africa for Al Jazeera English sent to Peter Greste, one of hundreds gathered (and thousands more sent) in a book being released tonight in Sydney, Prison Post: letters of support for Peter Greste.