But she won’t be. At least, not physically. In her line of work, if something goes wrong, it’s probably fatal; at best she’d be clogging up a hospital high dependency unit, and I’d be on my way out to see her with many hand-wringing apologetics and a complimentary budget-price ticket from Human Resources.

Hanging around in an airport Arrivals hall is not a good thing to do if you’re nervous. I can feel the cops’ eyes on the back of my neck, wondering what the unshaven agitated guy who can’t keep his feet still is doing. The minutes and seconds trickle by with glacial, infuriating slowness. Then the Arrivals board changes the flight status to arrived, and-

There she is. Coming out of the door from baggage claim in the middle of a clot of suits, violin case slung over her shoulder. Freckled skin stretched over high cheekbones, long red hair tied back out of her face, uncharacteristically dressed in office drag: that’s unusual, must be urban camouflage for whatever she’s been sent to do. Something about her gait, or the set of her shoulders, tells me she’s bone-deep weary. I wave: she sees me and changes course and I move towards her and we collide in a deep embrace that ends in a kiss.

She pulls back after a couple of seconds. “Get me home. Please.” She sounds-low.

“Andy said-”

“Andy is a wee bawbag and we’re going home. Taxi. Right now.” She’s leaning on me, swaying slightly.

“Mo? What’s wrong?”

“Later.” She draws a deep, shuddering breath. “Right now, let’s go home.”

“Can you walk?” She nods. “Okay, we’ll get a taxi.” It’ll be about twenty quid: I can’t afford to make a habit of it. But scratch worrying about money for the time being. If she feels too crap to face the tube…

We ride home in silence, wincing in synchrony as we bump over speed pillows and sway through chicanes and suffer all the other traffic-annoying measures that slow down ambulances and cost lives and triple the price of a simple taxi ride. I pay the driver and hold the door open for her and then we’re inside our front hall again, the door shut behind us, and she slumps against the wall as if she’s just run a marathon. “Coffee, tea, or something stronger?” I ask.

“Coffee.” She pauses. “With something stronger.” After a moment she levers herself up and shuffles into the living room, then collapses on the overstuffed sofa we inherited from her sister Liz when she emigrated.

I hurry back into the kitchen and refill the caff, then add a generous shot of cooking whisky to her mug. When I get back to the living room she’s still on the sofa, her violin case sitting on the pile of magazines on the coffee table. She seems to be shaking at first, in silent laughter: then I realize she’s crying.

I put the coffee mugs on the table and sit down next to her. After a moment she shuffles round and I pull her against my shoulder, so that her tears trickle down the base of my neck.

Mo cries helplessly, almost silently, pausing every few seconds to take a little hiccuping gasp of air. She’s so quiet-almost as if she’s afraid to make a sound. I hold her gently, and murmur inanities over the top of her head, stroking her shoulders. I’m angry at my own helplessness: I’ve seen her upset before, but never anything like this-

“What happened?” I ask, eventually, after the shudders give way to an occasional twitch.

“You don’t need to know.” She sniffles. “God, I’m a mess. Fetch the tissues?” We disentangle and I go in search of something for her to wipe her nose on. When I get back she’s sitting up, clutching her coffee mug and staring at the brick-surround fireplace we’ve been meaning to get rid of ever since we moved in, with eyes like wrecking balls.

I put the tissues in front of her on the table. She ignores them. “Was it wet?” I ask.

“You have no need to-” She shudders slightly, puts the mug down, and grabs a tissue. I notice her hands are a mess, reddish-brown grime ingrained around her nail beds: Jonathan Hoag territory. Holding the kleenex to her face she blows her nose once, twice: a peal of bloody trumpets. “It was ghastly. They made me-I think I can say this-Bob, remember the Plumbers?”

I nod. Deep in the pit of my stomach, I feel dread. “The job in Amsterdam. They shut you up with a geas afterwards, didn’t they? Was it that bad? No, don’t try to tell me. You just stay right there.”

She nods convulsively. “I can’t talk about it.” Emphasis on the can’t. I stand up. “I’m going to make a call.” I go through to the kitchen and speed-dial Andy.

“Hello?” Andy sounds distracted.

I take a deep breath. “Pay attention now, I will ask this only once: Who should I blame for this? You? Or that motherfucker Tom in Conflict Resolution? Or someone else? Because I’ve got a situation here.”

“What-” Andy pauses. “Bob? Is that you?”

“Mo is home from Amsterdam,” I say carefully. “She’s in a state, and she can’t unload on me because some cretin in Plumbing has drawn the magic circle too tight. I don’t know what happened out there, but she’s about two millimeters away from a nervous breakdown. I can’t help her if she’s blocked from talking to me, so let me explain the situation in words of one syllable: you are going to get the geas relaxed so she can vent about whatever happened yesterday, or the Laundry is going to have to replace a valued employee. No, make that two-no, three new employees they’ll be needing, by the time I’m through with whoever’s responsible. Capisce?”

“It wasn’t me!” Andy sounds shocked. “Stay on the line. Where are you, exactly?”

“I’m in the kitchen at home, that’s on file as safe house Lima Three Six. Mo was in the living room, last time I looked. Is that exact enough for you?”

“Probably…” I hear keys clicking hastily, a keyboard on a desk near his phone. “Listen, you aren’t cleared for this, and I can’t do it over the phone. Normally you would be cleared but that enquiry that’s pending has screwed up your-look, I’m tied up right now, but I’ll send someone round immediately, as soon as I can find a warm body. Can you hold the fort for an hour?”

“Who are you going to send, exactly?”

“The office bloody intern if I have to, as long as they’ve got an Oyster card and can carry a Letter of Release, will that do you?”

I sigh. “It’ll have to. Better hurry, though, or you’re going to be short-staffed next week.”

I go back to the living room. Mo is sitting on the sofa, immobile, in exactly the position she was in when I left. I shove the coffee table aside and kneel in front of her. “Mo? Talk to me?”

She’s staring right through me at the fireplace, vague and unfocused. “Can’t,” she says.

“I called Andy. The reason it won’t let you talk to me is the pending enquiry on my record.” It being the simpleminded geas someone in Plumbing dropped on everyone who witnessed the scene in Amsterdam. “I threatened to kick his arse and he’s sending a courier with a Letter of Release just for you.” A physical token that will release her from the geas. “He said it’ll take about an hour, maybe a bit longer. Can you wait that long?”

Abruptly, she makes eye contact. “Oh thank God,” she says. Then she slowly slumps forward, like a puppet whose strings have just been cut.

THIRTY MINUTES LATER, THE DOORBELL RINGS. I’m upstairs in the bedroom, sitting up with Mo, when I hear the chimes. It took a while to get her up there and into bed, propped up on pillows with the duvet pulled up to her chin-still wearing most of her street clothes-and a mug of coffee to hand. She’s shivery and a bit shocky but the color has begun to return to her cheeks, and ten minutes ago she asked me to bring her violin. She doesn’t like to leave it unattended, and she’s right-fuck knows what would happen if one of the local lowlifes put a brick through the window and snatched it, the thing’s about as safe as a loaded machine gun with no safety catch. So it’s sitting on the bed, and she’s got one hand on it, just to maintain contact.