ROME — Roberto Saviano went to war when he was 23.
The daring writer got on his motorcycle and prowled the savage empire of the Camorra, the Neapolitan mafia: ports, sweatshops, housing projects and toxic waste dumps.
The result was "Gomorrah," an angry, poetic expose of the mob's murderous might and swaggering, self-referential subculture. In the surprise 2006 bestseller, Saviano riffs on female gangsters who drive Smart cars and wear yellow jumpsuits like Uma Thurman in "Kill Bill." An underworld boss who modeled his garish mansion on the one in "Scarface" and named his son Ivanhoe because he reads Sir Walter Scott. Doomed teenage gunslingers nicknamed Tonino Kit-Kat and Donnie, as in Donnie Brasco.
Building on his success, Saviano was co-writer of a film adaptation that won the Grand Prize at the Cannes Film Festival this year and is Italy's entry for the Academy Awards.
But today, he lives like the fugitive gangsters whom he chronicled: enduring round-the-clock protection, changing hide-outs, avoiding daylight.
Last week, two unmarked police sedans with flashing blue lights stopped on a quiet hilltop street here. Three bodyguards with the smooth, tough air of Italian plainclothes police hurried out to escort the author into the offices of his publisher.
Saviano, a close-cropped 29-year-old, has the physique of an amateur welterweight boxer, a sport he has taken up to relieve stress. He alternates between steely determination and a brooding weariness. He has caused a commotion by saying he might leave Italy to escape the dangers and pressures of his vita blindata, or armored life.
"Right now the most difficult task for me is not writing a new book, but reclaiming my life," he said, slumped on a couch.
"I don't have a home. . . . I move constantly. My family lives in northern Italy. All the people I knew in the past have distanced themselves, my girlfriends, everybody, everybody, everybody."
Anti-mafia investigators, an internationally respected law enforcement elite, praise Saviano's courage in trumpeting their struggle to the world.
"I admire him because he created a new genre that has greatly widened the audience," said Antonio Laudati, a top Justice Ministry official who led major Camorra prosecutions in his native Naples. "This was an issue that primarily interested specialists, prosecutors, journalists. Saviano broke open a new front. He informed the man on the street. He turned our prosecution files into literature."
The book has brought death threats, smear campaigns and even lawsuits by the Camorra and its allies.
Last week, there were new rumblings. A longtime protected witness who was a kingpin of the Casalesi, as the gang from Saviano's hometown, Casal di Principe, is known, reportedly told an investigator about talk of a plot to kill Saviano before Christmas.
During the interview at his publisher's office, Saviano took a phone call from a friend in law enforcement: a disturbing update about a band of fugitives blamed for the machine-gun killings of six Africans in Castelvolturno; an apparent message over drug turf that caused the government to dispatch 500 soldiers to the region. The rampaging gang seems intent on further violence, possibly against a prominent target, Saviano said after hanging up.
"They have discovered that the hit team that is roving in [the province of] Campania has bought a detonator," he said. "So all of us who have security details are concerned. Because bombs are used to attack security details. This is a group that wants to die."
Amid headlines about the threats, Prime Minister Silvio Berlusconi and other public figures last week declared solidarity with Saviano and urged him to stay in Italy. The extent of the peril is not clear because the supposed tipster has retracted.
But anti-mafia officials have little doubt that Saviano remains in danger.
"There is a climate of tension and violence because they are in crisis," Laudati said. "Saviano has done [the Casalesi] enormous damage with his book. Three years ago, nobody talked about the Casalesi."
Saviano grew up among them. He was a doctor's son, but he was streetwise and obsessed with the smothering presence of the Camorra in his grim, claustrophobic region. In contrast to the secretive and hierarchical Sicilian Mafia, the Neapolitan mob is an anarchic archipelago of crime clans embroiled in constant turf battles. The bosses are ostentatious public figures who rise and fall rapidly.
But the Camorra maintains enormous power through its systematic infiltration of politics and, especially, business. Beyond drugs and extortion, its billion-dollar global rackets encompass fashion, cement and garbage collection. The title of the book alludes to the biblical city of sin, Gomorrah, cited in a denunciation of the mob by a crusading priest who was assassinated in 1994.