Peter's Square, so Quart had to skirt the square, taking shelter under Bernini's colonnade. As he walked up to the Portone di Bronzo, he saw the sentry standing with his halberd in the gloomy marble-and-granite corridor and preparing to ask for his identification. The man, tall and strong with a crew cut, was wearing the red, yellow, and blue-striped Renaissance uniform and black beret of the Swiss Guard. He stared at Quart's well-cut suit, matching black silk shirt with a Roman collar, and his fine, handmade leather shoes. Definitely not, the guard seemed to be thinking, one of the grey bagarozzi – the officials of the complex Vatican bureaucracy who passed through every day. But neither was the visitor a high-ranking member of the Curia, a prelate or monsignor. They wore a cross, a purple trim or a ring at the very least, and they definitely didn't arrive on foot in the rain. They entered the Vatican palace by another gate, St. Anne's, in comfortable chauffeur-driven cars. Anyway, despite grey hair cut short like a soldier's, the man looked too young to be a prelate. He stood politely before the guard and searched amongst the various credit cards in his wallet for his ID card. Very tall, slim, sure of himself, he looked calmly at the guard. His nails were well kept, and he wore an elegant watch and simple silver cufflinks. He couldn't have been over forty. "Guten Morgen. Wie ist der Dienst gewesen?v

The guard stiffened and held his halberd straight, not so much at the greeting – in perfect German – as at the sight of the letters IEA in the upper right-hand corner of the man's identity card, next to the tiara and the keys of St. Peter. The Institute of External Affairs was entered in the thick red volume of the Pontifical Yearbook as a department of the secretariat of state. But even the newest recruits to the Swiss Guard knew that for two centuries the Institute had been the executive arm of the Holy Office and now co-ordinated all the secret activities of the Information Services of the Vatican. Members of the Curia, masters of the art of euphemism, referred to it as God's Left Hand. Others called it the Dirty Work Department, but only in a whisper.