@Conkers999 You’re quite right. It rhymes with Trigger but we can’t use the actual name for a black Labrador and it was the code word for the (partial) success of the mission.
@dollyalderton @Fig_Tree_Books @PenguinUKBooks A short book? Like 'Humorous Tales From Daesh'? or 'The Book of Welsh Rugby Tactics'? Only kidding - good luck with it. I'll buy it!