At the fort I hit a snag.

'Password?'

'How should I know? I'm just a visitor.' In Germany a year after the rebellion rules were rules. It was sound practice-and a thorough menace to free-and-easy types like me.

Luckily the guard party belonged to the First and wanted to help. If they had been assigned from the Fourteenth I would have had to camp out all night.

I remembered my discussion with Justinus. '"Mars the Avenger"?'

'Try another.'

'"Pickled fish"?'

'Yesterday's.'

'Oh Hades-what about "The camp surgeon's middle name"?'

'Spot on,' said the sentry, though he failed to readjust his speartip from its dangerous aiming point, dead centre on my throat.

'So what's the problem, soldier?' I croaked wearily.

'What is it?'

'What's what?'

'What,' he enunciated clearly, 'is the camp surgeon's middle name?'

The Fourteenth were right: the First Adiutrix were a gang of crass deck hands and rigging monkeys, with brains as dense as cork.

I got in eventually. Anyone who has bluffed his way into a brothel on the Via Triumphalis while attempting to rescue a fake virgin from Cyrenaica-and got out again without losing his sense of humour or something worse-can deal with the simple-minded gateman of a frontier fort.

Fuming, but fighting it back in case anyone embarrassed me by asking what the matter was, I stepped out briskly for my billet. There was a good chance that if I failed to turn up by dinner-time, Camillus Justinus would go out to eat with his fellow-officers, leaving me to make the best of yesterday's bread rolls. I lengthened my stride, oblivious to everything but my traditional obligation as a guest to eat my host out of house and home.

The ambush was lying in wait for me four strides from the tribune's door.

XXVII

Three of them. A trio of soldiers wandering down the Via Principalis in a sweet reek of recent barley beer, sufficiently affected by the drink to become dangerous, but not drunk enough for me to handle on my own.

At first I thought they were just clumsy. They had lurched in my path, causing me to pull up short, like lads who were just too bad-mannered to notice my presence. Then they stumbled apart and regrouped: one either side of me, one behind.

Experience gave me an instant's warning that saved my life. I missed sight of the personal dagger, but registered the arm movement. I swung away sharply, crashing aside another assailant, but grabbing him to me like a bolster. For a moment he provided a human shield as I spun on the spot. His bristles scraped my cheek; his sour breath was disgusting. The moment of safety passed-he posed a greater threat if he went for me at close quarters. Loosening my grip would be fatal, but holding on was so bad I nearly opted for a one-way ferry ticket across the Styx.

He jerked free. Somehow I sensed what was in his mind and seized the chance to scramble half backwards. There was a house wall fairly close behind me, which offered slight protection. Instinct said to huddle close, but then I would be lost if they all rushed me at once. I managed a shout-not loud enough. After that I was too busy. There were plenty of personnel in the vicinity, but this incident was being nicely choreographed to look like nothing in particular. Who expects to see a mugging outside the officers' quarters? Come to that, who expects to be mugged?

Me, was the answer. Anywhere and everywhere I prepared myself for the worst. Thank the gods, these thugs had assumed I was whistling homewards in a trance. They had planned to catch me out completely, but found themselves surprised.

Quickly, I tried to take stock. I could see-there was a broad bar of light from an unshuttered first-floor window in the tribune's house. Right at the start a shadow had wavered across that light from someone moving in the room behind. I glanced up, hoping to attract attention, but now there was no sign of life.

My own knife was safely in my hand. Letting me get it had been a bad mistake. I was breathing hard with the shock of the first assault, but I was upright and mobile. Even so, the prospects looked gloomy. Every time I made a dagger feint, I tried to edge closer to the tribune's portico. I stood little chance of reaching it. Every time one of them made a feint, I was at risk from the others while I parried. At least they stuck with their daggers-drawn swords would arouse too much public interest. As we sidestepped in all directions they were still laughing and nudging one another so that it would look like good-humoured jostling. I had no time to rouse help.

I had made it one stride nearer the door, but was trapping myself in a tighter wedge between two of them and the wall, while the third soldier guarded against flight the other way. It was time for some fast talking, but my mouth dried so that I couldn't speak.

Almost without planning it, I lunged at the single man, then changed direction and tackled the other two ferociously. Blades clashed with a screech that hurt my eye-teeth; sparks flew. I was working so hard I hardly noticed that in the remote depths of the tribune's house a woman's voice cried out. I barged an arm skywards, and heard steel skidding on masonry behind me. Light from above increased. I glimpsed faces more clearly. Another shadow came and went, but I was too preoccupied to shout.

My own dagger went home somewhere, but awkwardly. I wrenched my shoulder retrieving it as one of my two men cursed and hopped on the spot. Events were becoming too public; the second mugger was all for scarpering. The third had more guts-or less wits. He sprang at me. I roared with annoyance. Then, just as I had enough to do dealing with all three at once, the tribune's door burst open. Someone stepped out, framed in black by the light behind. Wrong build for Justinus; too slight for his guards. Whoever he was, a trimly sinister shadow came gliding out of doors.

Defending myself against my attackers as they put up a last furious struggle, I could hardly take in what happened. The shadow stepped straight past me, met one of the soldiers and pulled his head back with a disturbing action. The soldier folded noiselessly, and dropped to the ground in a manner that was unmistakable. There was a moment of stillness. The two survivors ran for it with the speed of troops who knew what they had witnessed. I knew too, though it was difficult to comprehend.

No time for pursuit. I was too winded, anyway. The tribune's guards now rushed out with torches, followed by Justinus. Chaos and commotion raged, then sank in a sickly diminuendo as light revealed the dead man.

It was a horrific killing. The amount of blood was unbelievable. The soldier's head had been nearly severed from his body by a blade sharper even than military steel.

I turned to the man who had done it. He stood motionless, the weapon still held in a workaday grip. One of the tribune's guards made a feeble attempt to remove it, without achieving much-his nerve failed. Another raised a flare slowly, as if afraid of revealing something supernatural.

No such luck. All we saw were the glazed and manic eyes of a tourist whose latest adventure had left him startled at his own bravado and ingenuity.

'Xanthus!'

Oh dear. Now someone was going to have difficult questions to answer before the hapless world-traveller was given back his passport and allowed to go home.