Angleton's eyes narrow. "Was she indeed?" He picks up a pen and a pad and scrawls a list of numbers on it. "Well, when you feel like getting back to work, you might want to go down to the stacks and retrieve these documents from the dead file store. I think you'll find them very interesting." He signs the note and slides it across the table at me. The document references are just catalog numbers identifying files by their shelf location, no actual codewords referring to named projects. Typical of Angleton, to be so elliptical about things. "And I'd like you to deputize for me on the BLOODY BARON committee."

"Iris is putting me on light administrative duties," I protest.

Angleton smiles humorlessly. "Then you'll have something to do when you're bored," he says. "Be off with you!"

3. THINGS THAT GO BUMP IN THE DAYLIGHT

I EMERGE FROM THE STAFF ENTRANCE TO THE C&A ON THE high street, blinking like a groundhog caught in the headlights of an onrushing Hummer.

It is a Wednesday, just before the lunchtime rush, and the pavements are full of shoppers and people with nowhere better to go. A herd of buses rumble past, farting clouds of sulphurous biodiesel and lunging at cyclists. But I am not at work. Something is wrong with the world, something is broken: a wire has come loose in my soul.

I start to walk.

I don't want to go home just yet: it's sixty to seventy minutes of riding on two buses, but then I'll have nothing to do but sit staring at the walls for the rest of the afternoon. If it was a normal summer's day I could go for a walk on Wandsworth Common—it's only about a mile or two from here—but the sky is overcast and gray, threatening rain later on. Or I could go into town. Maybe get the tube to Euston and visit the British Library. I've got a reader's card, and there are some interesting manuscripts I've been meaning to look at for a while, relevant to the job . . . No, I can hear Iris ticking me off in the back of my head, telling me that's not what I ought to be doing when I'm on medical leave.

In the end, I walk to the next bus stop just in time to see the tail end of the herd vanishing round the corner, and wait nearly ten minutes for the next bunch of buses to arrive, with only my iPod for company—that, and a couple of students, a pensioner pushing a shopping bag on wheels, and an Uncle Fester type in a dirty trench coat who is pointedly not making eye contact with anyone.