Hanni bent down, peeled back the dead man’s lips. I saw two broken rows of decayed stubs where his teeth had once been.

“A tweaker,” Hanni said. “He was probably the cook. Lindsay, this case belongs to Narcotics, maybe the DEA.”

Hanni punched buttons on his cell phone as I stared down at Juan Gomez’s body. First visible sign of methamphetamine use is rotten teeth. It takes a couple of years of food- and sleep-deprivation to age a meth head twenty years. By then, the drug would have eaten away big hunks of his brain.

Gomez was on his way out before the explosion.

“So the bus was a mobile meth lab?” said Conklin.

Hanni was on hold for Narcotics.

“Yep,” he said. “Until it blew all to hell.”

Part One

BAGMAN JESUS

Chapter 1

CINDY THOMAS BUTTONED her lightweight Burberry trench coat, said, “Morning, Pinky,” as the doorman held open the front doors of the Blakely Arms. He touched his hat brim and searched Cindy’s eyes, saying, “Have a good day, Ms. Thomas. You take care.”

Cindy couldn’t say that she never looked for trouble. She worked the crime desk at the Chronicle and liked to say, “Bad news is good news to me.”

But a year and a half ago a psycho with an illegal sublet and an anger-management problem, living two floors above her, had sneaked into apartments and gone on a brutal killing spree.

The killer had been caught and convicted, and was currently quarantined on death row at the “Q.”

But still, there were aftershocks at the Blakely Arms. The residents triple-locked their doors every night, flinched at sudden noises, felt the loss of common, everyday security.

Cindy was determined not to live with this kind of fear.

She smiled at the doorman, said, “I’m a badass, Pinky. Thugs had better watch out for me.”

Then she breezed outside into the early May morning.

Striding down Townsend from Third to Fifth — two very long blocks — Cindy traveled between the old and new San Francisco. She passed the liquor store next to her building, the drive-through McDonald’s across the street, the Starbucks and the Borders on the ground floor of a new residential high-rise, using the time to return calls, book appointments, set up her day.

She paused near the recently rejuvenated Caltrain station that used to be a hell pit of homeless druggies, now much improved as the neighborhood gentrification took hold.

But behind the Caltrain station was a fenced-off and buckled stretch of sidewalk that ran along the train yard. Rusted junkers and vans from the Jimi Hendrix era parked on the street. The vehicles were crash pads for the homeless.

As Cindy mentally geared up for her power walk through that “ no-fly zone,” she noticed a clump of street people ahead — and some of them seemed to be crying.

Cindy hesitated.

Then she drew her laminated ID card out of her coat, held it in front of her like a badge, pushed her way into the crowd — and it parted for her.

The ailanthus trees shooting up through cracks in the pavement cast a netted shade on a pile of rags, old newspapers, and fast-food trash that was lying at the base of the chain-link fence.

Cindy felt a wave of nausea, sucked in her breath.

The pile of rags was, in fact, a dead man. His clothes were blood-soaked and his face so beaten to mush, Cindy couldn’t make out his features.

She asked a bystander, “What happened? Who is this man?”

The bystander was a heavyset woman, toothless, wearing many layers and textures of clothes. Her legs were bandaged to the knees and her nose was pink from crying.

She gave Cindy a sidelong look.