After Will leaves, my plans and overlays pinned at the corners with a stapler, coffee mugs and a couple of files, I set to work with the notes Will brought me, plus the extras I made during our conversation. Francis supplies me with sheets of self-adhesive dots in various colours, pins and string, pads of sticky notes. After some while, I realise I’m not alone. Instead of the tap-tap of the keyboard from my Master’s desk, warm air breathes behind my ear. Standing close behind me, he leans in. “Mind if I ask the significance of your various colours there?” He taps a fingertip onto my plan. “That’s Cop Central, obviously, but what’s this, for example?” He touches a finger to a green dot… “And this one?” tap-tap“Green marks major junctions where an officer in a vehicle could easily make his