‘Yet here I am.’

‘Here you are,’ the archbishop agreed. ‘Despite all indications to the contrary.’

And just my luck too, thought Zen sourly. Like every other Criminalpol official, he had to take his turn on the night duty roster, on call if the need should arise. In Zen’s case it never had, which is why he hadn’t at first recognized the electronic pager which had sounded while he and Tania were in bed. He shifted in his elegant but uncomfortable seat. Unachieved coition made his testicles ache, a common enough sensation in his adolescence but latterly only a memory. Tania had said she’d wait up for him, but it remained to be seen when — or even whether — he would be able to return to the flat.

On phoning in, he’d been told to report to the Polizia dello Stato command post in St Peter’s Square. The telephonist he spoke to was reading a dictated message and could not elaborate. The taxi had dropped him at the edge of the square, and he walked round the curve of Bernini’s great colonnade. As part of the Vatican City State, St Peter’s Square is theoretically off-bounds to the Italian police, but in practice their help in patrolling it is appreciated by the overstretched Vigilanza. But this is strictly the small change of police work, concerned above all with the pickpockets and the ‘scourers’, men who infiltrate themselves into the crowds attending papal appearances with the aim of touching up as many distracted females as possible. The high-level contacts between the Vatican security force and the police’s anti-terrorist DIGOS squad, set up in the wake of the shooting of Pope John Paul II, were conducted at a quite different level.

The patrolman on duty called a number in the Vatican and announced Zen’s arrival. He then waited a few minutes for a return call, before escorting Zen to an enormous pair of bronze doors near by, where two Swiss Guards in ceremonial uniforms stood clutching halberds.