‘Children love gore and horror,’ Della pointed out.

‘It’s about nightmares,’ Carlo went on, ‘and the greatest catastrophe the world has ever known. Thousands of people, living their ordinary lives, when there was an ominous rumble in the distance and Vesuvius erupted, engulfing the town. People died in the middle of fights, of meals-thousands of them, frozen in one place for nearly two thousand years.’

He had them now. Everyone was listening.

‘Is it true they’ve got the dead bodies in the museum?’ someone asked, with relish.

‘Not the actual bodies,’ Carlo said, in the tone of a man making a reluctant admission, and there was a groan of disappointment.

Bloodthirsty little tykes, Della thought, amused. But he’s right about them.

‘They were trapped and died in the lava,’ Carlo continued, ‘and when they were excavated, centuries later, the bodies had perished, leaving holes in the lava of the exact shapes. So the bodies could be reconstructed in plaster.’

‘And can we see them?’

‘Yes, you can see them.’

A sigh of blissful content showed that his audience was with him. He began to expand on the subject, making it vibrantly alive. He spoke fluently, in barely accented English, with an actor’s sense of the dramatic. Suddenly the streets were populated with heroes and villains, beautiful heroines, going about their daily business, then running hopelessly for their lives.

Della seized the chance to study him in action. It went against the grain to give him top marks, but she had to admit that he ticked every box. The looks she’d admired on the screen were enhanced by the fact that his hair needed a trim, and hung in shaggy curls about his face.

He looked like Jack the Lad-a brawny roustabout without a thought in his head beyond the next beer, the next girl, or the next night spent living it up. What he didn’t look like was an academic with a swathe of degrees, one of them in philosophy.