With his head down, muttering and sour, Massimo was weaving across the millions of square stone cobbles of the huge Piazza Vittorio Veneto. As if through long experience, he found the emptiest spot in the plaza, a stony desert between a handsome line of ornate lamp-posts and the sleek steel railings of an underground parking garage.

He dug into a trouser pocket and plucked out tethered foam earplugs, the kind you get from Alitalia for long overseas flights. Then he flipped his laptop open.

I caught up with him. “What are you doing over here? Looking for wifi signals?”

“I’m leaving.” He tucked the foam plugs in his ears.

“Mind if I come along?”

“When I count to three,” he told me, too loudly, “you have to jump high into the air. Also, stay within range of my laptop.”

“All right. Sure.”

“Oh, and put your hands over your ears.”

I objected. “How can I hear you count to three if I have my hands over my ears?”

“Uno.” He pressed the F-1 function key, and his laptop screen blazed with sudden light. “Due.” The F-2 emitted a humming, cracking buzz. “Tre.” He hopped in the air.

Thunder blasted. My lungs were crushed in a violent billow of wind. My feet stung as if they’d been burned.

Massimo staggered for a moment, then turned by instinct back toward the Elena. “Let’s go!” he shouted. He plucked one yellow earplug from his head. Then he tripped.

I caught his computer as he stumbled. Its monster battery was sizzling hot.

Massimo grabbed his overheated machine. He stuffed it awkwardly into his valise.

Massimo had tripped on a loose cobblestone. We were standing in a steaming pile of loose cobblestones. Somehow, these cobblestones had been plucked from the pavement beneath our shoes and scattered around us like dice.