Inside, the foyer was empty, and I noticed Jenny frown as she swiped a card through the space-age-looking reader, releasing the lock on the double doors. 'There should be a doorman on duty,' she said. 'That's what we pay our maintenance for.'

I wasn't quite sure what you needed a doorman for if you had to use a key to get in the building, but I was pleased he wasn't there. I didn't want any witnesses to what I knew was going to be the betrayal of my oldest friend, especially if – God forbid – Dom and Jenny ever did get back together. Although to be fair, that wasn't sounding too likely.

As we got inside and she pressed for the lifts, I heard rapid footsteps coming from the hallway behind the front desk. It sounded like the doorman was returning, so as the lift doors opened I hurried inside and pressed myself against the wall, still worried about being seen.

Jenny followed me in, standing in the middle, and as the doors began to shut she called out, 'Hello, John, I thought you'd gone on strike.'

'Toilet break,' I heard the doorman call back, and then the doors closed, and she pressed for Floor 9.

We looked at each other for a long second and I knew immediately what was going to happen. She leaned forward. So did I.

The first kiss was hesitant, just like it always seems to be in the movies, and I felt my last twinge of guilt evaporating.

The second kiss was harder, longer, and I hardly noticed the lift doors opening again. We paused for a couple of seconds, then she took me by the hand and led me down a short corridor to her front door, kissing me once again before we manoeuvred our way inside, still attached to each other at the mouth.

Jenny's place was nice, as befitted a swanky building like this, opening directly into a spacious, neatly furnished lounge with floor-to-ceiling windows offering views across the park.

She let go of me for a moment and took a step backwards. 'I'm not always this forward, you know.'

'I know,' I said. Which I didn't, of course, but I thought this was probably what she wanted to hear.

'It's just I've always had a bit of a soft spot for you.'

'I guess I've had one for you as well,' I admitted.

'Do you want a drink of something?'

I'll never forget my next words, mainly because they were so hackneyed, and did whatever reputation I had as a romantic or a wordsmith no good at all. 'No,' I said, 'I just want you.'

Something about it must have worked, though, because the next second we were kissing again.

We remained like this for several minutes, our hands running up and down each other's bodies, exploring hungrily, before she whispered huskily that it was time to go to bed.

I wasn't arguing, and we walked sideways, crab-like, still locked together, through to a spacious bedroom with mirrors on the walls and a king-sized bed with black satin sheets which, I have to say, looked to be designed for just this kind of encounter.

She pulled my jacket off and flung it into the corner, then tugged at my belt.

Unfortunately, this was also the moment when, with impeccable timing, I experienced every man's nightmare in this situation: the nagging urge to pee. I really didn't want to say anything for fear of breaking the mood, but I also knew that, my bladder being what it was, I was going to have to, otherwise the urge would get steadily stronger, which would risk ruining everything.

I waited another thirty seconds, hoping it would go away. It didn't.

'I've just got to go to the bathroom,' I mumbled into her lips.

'It's over there,' she mumbled back, pointing at a door to my right. 'Don't be long.'

'I won't,' I said, breaking away.

The bathroom was vaguely disappointing after the opulence of the rest of the apartment. It might have been en suite but it was windowless and way too small, as if the designers had made a mistake with their measurements and run out of room, and it was quite a squeeze to stand in front of the toilet without tumbling backwards into the bathtub.

There are few things more likely to put off a first-time lover than hearing her partner peeing loudly, so I turned the sink's cold tap fully on to mask the noise. Then, once I'd finished and flushed, I washed my hands and inspected myself in the mirror, thinking that I wasn't looking too bad considering I'd been out drinking for the best part of the last eight hours. I even pulled a sexy pout, looking at myself sideways on.

Which was the moment when I heard Jenny gasp once, very loudly, and cry out.

I froze.

The cry was stifled suddenly. Someone had a hand over her mouth. And then I heard movement outside the door and the unmistakable sound of two men whispering urgently to each other.

'Hold her still,' I heard one of them hiss, his accent harsh and distinctly Northern Irish. 'I need to get the needle in.'

Jenny's muffled cries suddenly became more desperate.

'Shut the fuck up and stop wriggling!' I heard the other one snap in a rough London accent, followed by the sound of a hard slap.

I had no idea what was going on in there but I knew I had to intervene because Jenny was being attacked. But I was absolutely rooted to the spot. I'm no hard man like Maxwell. I'm just an ordinary mortal coward who reads the stories in the papers every day about the senseless killings of those individuals brave enough to help victims of crime. I'd always said that I would never ignore someone's cry for help because I'd never be able to live with myself if I did. But now that it was happening, only feet away, I found that I couldn't move as the fear and adrenalin coursed and swirled through my body.

Jenny's cries stopped. Just like that.

Do something! my inner voice roared at me. But what the hell could I do?

'Thank Christ for that,' said the Londoner with a loud sigh, his tone suddenly more relaxed. 'She's a looker though, ain't she?'

'Don't even think about it,' answered the Irishman dismissively, and this time his voice came from right outside the bathroom door. 'We haven't got time. Get her off the bed. I need a leak.'

As he spoke, the door handle began to turn.

Jesus Christ! The bastard was going to come in here, and I'd locked the door! As soon as he realized that it was locked, he'd know there was someone in the apartment, and that would be it. I was trapped. One minute preparing to make love to an attractive woman, the next praying for my life.

The handle kept turning. The guy kept talking. My heart kept hammering.

Do something!

I leaned over and flicked back the bolt, hoping his voice would muffle the sound. Then, moving quickly and trying to make as little noise as possible, I stepped into the bathtub and pulled the shower curtain across so that I was hidden.

Just in time. In the next second, the door opened and he came in, shutting it roughly behind him.

I froze again, teeth clenched, not even daring to breathe as he stood in front of the toilet and unzipped, grunting loudly, only inches away. He was medium height, with the kind of contoured leanness that suggested he worked out a lot more than me, and if I'd put out my hand, I could have tapped him on the shoulder through the curtain – he was that close.

He seemed to take for ever, and every single second I wondered if some sixth sense would alert him to my presence. But at last he finished, and as he flushed and walked back out, not bothering to wash his hands, I finally breathed again.

This time he left the door open and, though I knew that in the interests of self-preservation, if not honour, I should stay exactly where I was until they left, then call the police, I couldn't resist peeking round the edge of the curtain.

From the tight angle I had, I could see the bottom quarter of the bed and the area immediately in front of it, which was taken up with what looked like a large cleaning trolley. I could also see Jenny's bare legs from the knees downwards, now missing the jeans she'd been wearing when I'd left her just a few minutes earlier. The intruders were nowhere to be seen. I could only assume they were going to rape her, the bastards, although I knew they wouldn't have had time to undress her. She'd clearly been undressing for me and I was filled with anger at the thought of these bastards violating her.