Rossi said, “Not many of those here. We are a very crowded city.”

Beatrice said, “And Naples has more underground passages and walkways than any other city in Italy. Perhaps than Europe. Kilometers after kilometers.”

Ercole disagreed. “But not so many where access is in deserted places.”

The lab analyst muttered to him, “No, I think many. We must find other ways to narrow these concerns down.”

Rhyme said, “A map. There has to be a map of underground locations.”

“Historical documents,” Daniela offered.

With a smile, Ercole said to her, “Yes, of course. From a library or a college or a historical society.”

Rhyme turned to him and his eyebrow rose.

Ercole hesitated and said, “Is that wrong? It was just a suggestion.”

Rossi said, “I think, Ercole, that Captain Rhyme is not questioning your thought—which is a good, if obvious, one—but your delay in providing such maps.”

“Oh, yes, yes, of course.”

Sachs told him, “Go online. We don’t have time for you to prowl though libraries like The Da Vinci Code.”

Must have been a book, Rhyme supposed. Or movie.

Sachs asked Beatrice, “You mentioned the underground passages here. Are there walking tours?”

“Yes,” she replied. “My sister’s children, we are going on such tours. Several, three times.”

“Ercole,” Rhyme called, “download all those tour routes too.”

“Yes, I will. You mean so that we can eliminate those areas from our underground search. Of course he would avoid places with tourists.”

“I want to orient myself. A map of the city. We need a map.”

Rossi spoke to Daniela, who vanished then returned a moment later with a large foldout map. She taped it to the wall.

“How are we coming, Ercole?”

“I…There are quite a few underground areas of the city. I didn’t realize how—come si dice—how extensive the passages are.”

“As I was saying,” Beatrice offered to Ercole.

“Some are contradictory. Indicated on one map but not another.”

“I would think certain underground areas will have been filled in, construction,” Rossi said. To Rhyme, Sachs and Thom he said, “This is a problem in Italy. A real estate man wishes to build an office or apartments and as soon as the excavation is started, a Roman or—here often—a Greek ruin is discovered, and all construction comes to a stopping.”

“Give me something to work with, Ercole. We need to get on this.”

“I have some, a few passageways, old buildings, grain storage warehouses, even some caves that are promising.” He looked up. “How do I print?” he asked Daniela.

“Here.” She leaned over him. She typed and a moment later, the Hewlett-Packard in the corner came to life. Rhyme didn’t know why he was surprised—perhaps because he was in an ancient city, looking at ancient maps; wireless printing routers seemed out of place.

Sachs fished the pages from the tray and handed them to Daniela. Rhyme instructed, “Draw the passages on the map.”

“Tutti? All of them?”

“Except the ones that seem to be bricked off.”