It began on the day when Kendrick Gallmon's heart stopped beating for ever.

The pain crashed down on him suddenly and he sagged, unable to prevent his legs crumpling at the knees. He looked down at the stained interior curve of a toilet bowl and gripped its cool ceramic sides with shaking hands, his ears full of the sound of his own laboured gasping. He vomited noisily, bright agony rushing through his every nerve ending, like wildfire surging through a tinder-dry forest. He watched his knuckles turn white where they gripped the porcelain, and he wondered if he was going to die.

And then, mercifully, the pain began to ease off, leaving him gasping and shivering in the chilly cubicle. He could feel his knees turning damp through his thin cotton jeans. His mouth tasted acid and foul.

Reaching inside his shirt with a couple of fingers, Kendrick touched the bare skin of his chest. It felt cold and smooth, like a marble statue. Next he applied them to his wrist and tried to find a pulse. Finding nothing there, the knowledge sent a chill sweeping through him, so intense that it made his teeth chatter. He moaned in horror, convinced he must have somehow got it wrong.

But he knew the truth. Something had changed inside him, for ever.

Kendrick stumbled to his feet, triggering a series of vivid, dizzying flashes behind his eyes: until it passed, he had to lean with one shoulder against the cubicle's graffiti-stained door. He sucked in air through his nostrils, calming himself steadily.

As suddenly as it had come, the pain washed away, like some Pacific storm leaving a devastated village in its wake. Random, disassociated thoughts tumbled through his mind like flotsam. He glanced down into the toilet and grimaced, before hitting the flusher.