The young man or woman sings along with the song again again, putting their head back as they do so. Probably female; neck smooth, no real Adam's apple.

You look again at that power cable.

Your mouth is dry. What to do? It could be so quick, so easy and it would simplify things so much. It is almost as though fate is saying, Look, I've made it easy for you; just get on with it, do it. Whoever or whatever they are they're associating with this man and if they don't know what he does then they should.

But you're not sure. This violates the code, this goes against what you originally decided were your operational parameters. There have to be rules, laws, for everything; after all, there are even rules for war. Maybe this is fate testing you, offering you a litmus test, an apparently simple way round a problem that will prove you, find you out. If you take the easy way you will have failed, and nothing will save you then, not your skill, not your determination or righteousness, and not your luck because that will have turned against you.

The young person in the tub looks happy enough for now. You go to the bed, put down the umbrella and start looking in the drawers and cupboards built into the wall units surrounding the head of the bed. You keep glancing to the bathroom door. The drawers slide smoothly in and out without a sound; one of the perks of picking on the well-off rather than the chipboard classes.

You find a gun. Smith 8c Wesson.38. Loaded. Box of fifty rounds. You permit yourself an almost inaudible sigh and grin to yourself.

You lay the knife beside the umbrella, heft the gun and put it under the duvet to click the safety off. Peek in the drawer again. No silencer; that would be too much to ask for.

But then in another drawer you find something maybe even more useful. You stare at the gear in the drawer, a glow in your belly spreading through you. You have made the right choice and you are being rewarded. You glance over the thick tubes that make up the emperor-size brass bedstead, and smile.

You take the bondage hood out of the drawer. It zips up the back and its only feature is a nose-shaped crease with a couple of little nostril slits at the base. You take out your penknife and cut a couple of eye-holes, continually glancing at the bathroom door.

You try the hood on, then take it off and slit some more leather off the eye-holes. You put it on again, zipping it up halfway at the back. It smells of sweat and that scent Mr Azul favours. You take one of the pairs of handcuffs from the drawer and go into the bathroom, pointing the gun at the figure in the tub.

"Jem," she says, "what are you —?"

You decide to use your Michael Caine voice. It doesn't sound very much like Michael Caine, but then it doesn't sound like your own voice either and that's all that matters.

"It's not fucking lover-boy, dear, now get out of the fucking bath and do as you're told and you won't get hurt." It's not too bad; the mask helps disguise your voice too.

She stares at you, mouth open. It's a bad time for the doorbell to go, but that's what happens. She looks past you.

"Make a noise, darling," you say quietly, "and you're fucking history, understand?"

The doorbell goes again. The Eurythmics song finishes and you put a foot on the ghetto-blaster's power cable and drag it smartly across the bathroom tiles, pulling the lead from the back of the machine. You half expect the next song to start anyway because there are batteries in it, but, instead: silence.

The girl stares at you.

You watch her. It all feels strangely academic, as though you don't really care what happens next. If she does make a noise you probably won't shoot her, and anyway there's a chance she couldn't make enough of a noise to be heard outside the front door; it's a big house and although there are a lot of hard, sound-reflective surfaces in it, you're not convinced a scream would make it all the way to whoever's outside, either down the stairwell or through the double-glazed balcony windows. Plus, of course, you might have time to get over to her and hit her, knock her out before she could even gather a decent breath, but it's dangerous, edge-working stuff and you'd rather not have to think about that.

The doorbell doesn't go a third time.

You pull a towelling robe from the back of the door and throw it at her. She half catches it as it lands to one side of the Jacuzzi. "Right. Put that on now, come on."

You expect her to crouch and try to put the robe on before she's fully out of the water, or to turn her back to you, but instead there's something like a sneer on her face as she stands up facing you and wraps the robe around herself with a kind of disdain. She has a good body, and that single vertical tuft of pubic hair you need if you're a model or the possessor of a high-cut swimsuit.

She puts her head back with a nervous, resigned sigh when you put the gun to her head but she doesn't try anything as you cuff her hands behind her back. You tape her mouth then you walk her down to the kitchen and down into the cellar. As you pass through the hall you notice that Mr Azul is just where you left him.

The cellar provides lots of rope. You tape her fingers together and then tie her — sitting on the floor — to a stout wooden workbench. You remove anything sharp from the workbench surface and check there's nothing within reach of her legs. You take some of the rope with you. You go back up to Mr Azul, and he's gone.

You go stupid on yourself for a moment, as the luck wobbles, threatens to fly away and leave you; you stare at the place where he was, lying curled up, tied up in front of the door; you stare at the empty stretch of carpet, dumbly, as if staring will help.

Then you turn and run into the main lounge.

He's there, still curled up and still secured by the tape, but he must have wriggled his way through to here while you were down in the cellar; he's knocked over a table with the phone on it and he's just turning the phone the right way up as you enter the lounge and see him.

He wriggles, getting his face over the buttons on the base of the phone. He stabs at the buttons three times, then wriggles over to the handset and makes muffled shouts through the gag until you cock the gun and he hears it and looks round at where you stand, next to the wall, waving the telephone's wall-plug.

You haul him upstairs and throw him on the bed; he struggles and tries to shout. It's getting dark, so you turn the pink pastel vertical blinds closed and pull the curtains before putting on the lights. Mr Azul screams through his silk socks and masking-tape. You hit him. He's only groggy, not out, but you're able to secure him to the bed with the other set of handcuffs and the leather straps from the same drawer the hood came from. You're satisfied he's tightly held; the bed is sturdy and the straps are supple but quite thick. They fit perfectly. He struggles a little.

Then you take the rope you brought from the cellar and measure out four lengths, cutting them with your penknife.

You tie one length round Mr Azul's upper right arm, as close to his armpit as possible, over his silk shirt; you kneel on the bed and haul with all your might and the rope bites deep into the sheen of the pale silk shirt; Mr Azul cries out behind his gag; a strangled, anguished shriek.

You do the same to his other arm.

You tie his legs too, fitting the rope up to his crotch and tying it tight, bunching the fabric of the slacks. Mr Azul bucks up and down on the bed in a bizarre parody of sexual energy. His eyes are popping and sweat stands out on his skin. His face is going red as his heart struggles to pump blood down arteries blocked off by the ropes.

Then you take out the little plastic box from your jacket and show him the syringe needle. He's still bucking up and down and he's shaking his head too now and you're not sure he understands, but it doesn't matter all that much. You prick him once on each arm and leg. This is a refinement you thought of only recently and are quietly proud of. It means that even if he is discovered in time, before necrosis sets in, he will be HIV-positive.