There's a crack of dead branches under the trees behind me. Panting inhuman breath punctuates the thudding of a four-footed pursuit. The orange sodium glare leaches away around me, giving way to a different shade of darkness. Trees loom overhead, clutching at each other with wizened arms as bony as concentration camp victims'. A thin mist at foot level obscures the tarmac path and my stomach lurches. I'm not running through suburban London anymore; I'm running along the ghostly track bed of the Necropolitan line, and the hounds of hell are on my trail, and I left my protective ward with Mo, and I am a fucking imbecile. Shit, shit, shit.

Whatever the thing behind me is, it's only seconds away. My heart's already thudding uncomfortably from jogging an hour after dinner—fucking stupid of me—but while I'm ninety percent sure that I'm being tracked by something that's about as bad as the proverbial hellhound, in which case I really ought to simply plug it with my pistol and ask questions later, I've got an even nastier feeling that it's tracking me for someone, or worse, herding me along.

I have: a gun, a Hand of Glory, and a JesusPhone. So of course I draw my phone and flip the case open, thumb-swipe to unlock, and spin round, raising the camera to focus as I tap the grinning skull icon.

There's method in my madness and my pursuer isn't mindless—I get a glimpse of flying haunches and bushy tail as it leaps off the path and into the trees with a startled "yip!"

The screen flashes a red-rimmed maw gaping at me and my hair stands on end as the phone and my fingertips are engulfed in pale blue fire. Balefire , it used to be called. I hastily go back to the main screen and stab another app: a diagnostic. Seeing what it says, I swear quietly and pull up another one that sets a spinning wireframe projection of a 5D Tesseract on the screen as it does its valiant best to set up a ward around me. The dog-thing is hiding and the tendrils of mist draw away from my feet, so I shove the phone in my pocket—still running—and draw my pistol. Then I turn back to the way I was going.