Taylor will have finished shopping by now. She's probably already in this fucker's Stingray, with her skirt up around her waist. As I picture it, her grown-up panties become skimpy just to finish me off. Now they're reckless bikini numbers, tight and fast, with a tiny bow on the waist elastic. They slash and slice me. A wet patch the size of a dime glistens on her mound, and if you take a silky buttock in each hand, lift her off the seat, and snuff your face up close, you only whiff the bittiest thumbtack of tamarindo jerky, just a pin-prick. That's how squeaky clean she is, even on a hot lathery day like today. Squeaky clean, like a doll. Oh Taylor, oh fucken Tay.

The unexpected thing when the bus rolls into McAllen is the stillness. The driver switches off the engine, the door goes 'Pschsssss,' and the world just parks. It's nearly eleven o'clock and there's a new silence, loud with the creasing of clothes, as I rise out of the seat. It's like waking from a fever, specially after all these venomous thoughts. I follow other unfolded travelers to the front of the bus, where a smoky breath meets me at the door. Maybe a tang of freedom. The border is less than ten miles away.

I savor the glassy crunch of my New Jacks on the concrete, and with it grows a feeling that at least I'm still alive, still have my arms and legs, and the dreams that fucken kill me. And twenty-one dollars and thirty cents. The mostly empty bus terminal shines a promise of comfort, so I shuffle over to look for a coffee, or maybe a sandwich, anything to stop my bowel cells from applying for other jobs in the body. A Mexican boy sweeps the floor by the doors, and two ole ladies doze on chairs next to some boxes tied with rope. Upholstery weeps flea-powder and farts. Then my eye catches a TV at the back. It's the news. My brain says, 'Don't fucken go there.' I fucken go there.

'New shock for the Central Texas community of Martirio,' says the screen. Red and blue lights flash off the slick of a recent shower. Vaine Gurie stumbles up a driveway near the edge of town. She wears a tracksuit, and shields her face from camera lights. Another big woman helps her through a screen-door, then turns to the cameras.

'Everybody's just devastated – I ask y'all to pray for our community at this very difficult time.'

Cut to daylight. Crime tape flaps wearily across the Johnson road, around where my journey began last night. Lally enters the frame, walking towards the camera. His arm is in a sling. 'I was lucky to escape the scene. With a broken collarbone, and serious cuts and bruises, I can only be thankful I was here to witness a crime that dispels all doubt as to the cause of recent events in Martirio.' The stringy man from the morgue hovers over a corpse wrapped in plastic. Troopers haul it behind Lally to a waiting van. 'Barry Enoch Gurie was not so lucky. His body fell less than a hundred yards from the practice range of Martirio's elite new SWAT team – a team he was to have joined only hours after he was brutally gunned down with his own weapon.'

A picture appears of Barry as a cadet, shiny-eyed, hoping blindly into the future behind the camera lens. Lally returns with a deeper scowl. 'I was an unfortunate witness to the shots, shots that cut short the life of a man who overcame childhood autism to become a glowing star in law management, an officer described by colleagues and townsfolk alike as a true human being. As federal forces descend upon the stricken district, attention now turns to the whereabouts of confirmed killer Vernon Gregory Little…'

My school picture appears, followed by footage of me leaving the courthouse with Pam. Then a stranger in thick glasses comes on, wearing overalls and rubber gloves. 'The forensic environment is near perfect,' he says. 'We've already identified the tread of a sports shoe – an unusual kind of shoe for these parts – and there's evidence of tracks being covered up around the body's resting-place.'

Lally returns. 'The task of securing the state's borders and highways will continue long into the night – authorities warn the suspect may be armed, and should not be approached…'

I slap a stone eye around the terminal. The janitor sweeps halfheartedly in front of the restrooms. Behind a counter, a ticket clerk taps listlessly at his keyboard. I take a measured walk between them to the doors, then aim for the dark of the road and run, fly back to the highway.

I cross the highway at the darkest point, and pound along its shadow side, invisible, just two clear veins throbbing slime and lightning. Up ahead a road sign points to Mexico. Traffic trickles past it. I don't even know how far I have to go, I just run till I'm dead, then limp till I can run again. It's after midnight when the sparks die under my feet. I slow to a shuffle, and strangle a hiss in my throat. Waves loom at my back, crested waves which instead of foam spill flies, flies I have to kill, thoughts of defeat in a grubby swarm. Jesus comes with them, waving, but he's engulfed, drowning, gulping flies that join with the night to claim all his colors, return him to black. I stop, the way a rock stops that never moved. My head hangs buzzing in the dark, and when I raise it up, after a century's pause, I see a glow up ahead. I stumble forward, and see the glow become a glare, a kind of high-beam extravaganza in the middle of nowhere.

' International Bridge – Puente Internacional,' says a sign. ' Mexico.'

From here the border looks like Steven Spielberg built it, a blast of arctic light framed in darkness. I pull on my jacket, though it ain't cold at all, and attempt to slick back my hair. I stride the last few hundred yards of home.

Lines of trucks stretch into the dark on the other side of the bridge, cars heavy with people pass through the middle. There's plenty of traffic on foot, even now, and no sign of a roadblock, except for the regular border checkpoints. I step onto the bridge knowing I step into my dream, pinning its fucken hem with my foot, for me to climb aboard. The redemption, the souvenirs, the lazy panties in fragrant sunshine.

You can already tell one thing: the clean concrete highway ends at the borderline, it's a different country after that. Tall, small people flow around me like tumbling store-displays, chubby types in denim carve between them, with all the confidence of home. Mexicans. The faces seem cautious, like you might interrupt a promise made to them. The hem of their dream hangs over this bridge too, that's why. You can taste it. I pass by an ole man wearing Ray-Bans, a Baywatch cap, a Wowboys jacket, fluorescent green Nikes, and carrying a Nintendo box tied with South Park bedsheets. Makes me stand out like a fucken shaved wiener, even aside from being six inches taller than everybody.

Checkpoint buildings sprawl on the Mexican side, officials in uniform stop cars and search them. I stand up my jacket collar, and try to lose myself in the flow of people. I nearly make it too, until I hear this voice.

'Joven,' calls a Mexican officer. I start to scuttle. 'Joven – Mister!' I look around. He holds up the flat of his hand.