The file was marked with Martha Gessler’s name on the tab. I took out my notebook and wrote that down at the top of a fresh page before opening the inch-thick file folder and seeing what Lindell had left me. I figured I had maybe fifteen minutes tops to look through the file.

On top of the documents stacked in the file was a single page with nothing on it but a phone number. I figured this was left specifically for me so I folded it and put it in my pocket. The rest of the file was a collection of investigative reports, most of which had Lindell’s name and signature on them. It listed him as working for the OPR. I knew that was the Office of Professional Responsibility, the bureau’s version of Internal Affairs.

The file contained the reports detailing the investigation into Special Agent Martha Gessler’s disappearance without a trace on March 19, 2000. This date was immediately significant to me because I knew Angella Benton was murdered the night of May 16, 1999. This put Gessler’s disappearance roughly ten months later, about the same time that Cross said the agent had called Dorsey about the currency number.

According to the investigative file, Gessler was working as a crime analyst, not a field agent, at the time of her disappearance. She had long since transferred from the bank robbery unit where she had known my wife and into a cyber unit. She worked Internet investigations and was developing computer programs for tracking criminal patterns. I assumed the program Cross told me about was something that came out of this assignment.

On the evening of March 19, 2000, Gessler left work in Westwood after a long day. Fellow agents remembered her being in the office until at least 8:30 p.m. But she apparently never made it to her home in Sherman Oaks. She was unmarried. Her disappearance was not discovered until the next day, when she did not show up for work and did not answer phone calls or pages. A fellow agent went to her home to check on her and discovered her missing. He found her home partially ransacked but later determined her two dogs, crazed with hunger and inattention, had spent the night tearing the place apart. I noticed in the incident report that the fellow agent who made this discovery happened to be Roy Lindell. I wasn’t sure if this meant anything. Possibly as an agent assigned to the OPR he would be sent to check on a fellow agent’s well-being. Nevertheless, I wrote his name under hers in my notebook.

Gessler’s personal car, a 1998 Ford Taurus, was not found at the house. Eight days later it was located in a long-term parking lot at LAX. The key was left on top of one of the rear tires. The rear bumper showed an eighteen-inch surface scratch and a broken taillight, damages acquaintances of the agent said were new. Again, Lindell was listed in the reports as one of these acquaintances.

The trunk of the car was empty and the interior offered no immediate clues as to where Gessler was or what had happened. The briefcase containing her laptop computer that she was known to have left the office with was gone as well.

Forensic analysis of the entire car found no evidence of foul play. No record of Gessler taking any flight from LAX was ever found. Agents checked flights at Burbank, Long Beach, Ontario and Orange County airports and also found no flight with her name on the passenger list.

Gessler was known to carry an ATM card, two gas credit cards as well as American Express and Visa cards. On the night of her disappearance she used the Chevron card to buy gas and a Diet Coke at a station on Sepulveda Boulevard near the Getty Museum. The receipt indicated she purchased 12.4 gallons of midgrade unleaded gasoline at 8:53 p.m. Her car’s tank held a maximum of 16 gallons.

The purchase was significant because it placed Gessler in the Sepulveda Pass -her normal route home from Westwood to Sherman Oaks-at a time that coordinated with her leaving the bureau offices in Westwood. The night-shift cashier at the Chevron also identified Gessler from a photo lineup as a regular customer who had bought gas on the night of March 19. Gessler was an attractive woman. He knew and remembered her. He had told her she didn’t need to drink Diet Coke and she seemed pleased by the compliment.

This confirmed sighting was important for several reasons. First, if Gessler was going from Westwood to LAX, where her car was later found, it was unlikely that she would have traveled north into the Sepulveda Pass to buy gas. The airport was southwest of the bureau office. The service station was directly to the north.

The next significance was that Gessler’s Chevron card was used a second time the same night at a Chevron service station off Highway 114 in the north county. The card was used at point of purchase to buy 29.1 gallons of gasoline, more than Gessler’s and most other cars could hold. Highway 114 was the main route to the desert areas of the northeast county. It was also a major trucking route.

Last but not least in terms of significance was the fact that none of Gessler’s credit cards were ever found or used again.

There was no summary or conclusion in the reports I scanned. This would be something the investigator-Lindell-would draw for himself and keep to himself. You don’t write a report concluding that your fellow agent is dead. You don’t say the obvious and you always speak about the missing agent in the present tense.

But it was clear to me from what I had read what the conclusion had to be. Sometime after Gessler pumped gas into her car in the Sepulveda Pass she was stopped and abducted and it didn’t look like she was coming back. She had probably been rear-ended. She then pulled to the side of the road to check damage and possibly to exchange insurance information with the other driver.

What happened next was unknown. But she was likely abducted by force and her car was dumped at the LAX lot-a move that probably guaranteed it would not be located for several days, thereby allowing the trail to go cold and the memories of potential witnesses to fade.

The second gas purchase was the curiosity. Was it a mistake, a clue pointing to the direction of the agent’s abductors? Or was it misdirection, an intentional move by the abductors to point the investigation the wrong way? And the amount of gasoline purchased raised a whole other question. What kind of vehicle were they looking for? A tow truck? A pickup? A moving van?

Bureau agents descended on the station but there were no exterior video cameras and no credible witnesses to the use of the credit card because it had been a pay-at-the-pump purchase. It was the last blip on the radar screen, but nothing more than that.

Nevertheless, an agent was still missing. There was no choice. The file contained the short summaries of three days of aerial searches over the desert of the northeast county. It was a needle-in-the-haystack operation but it had to be done. It proved fruitless.

Agents also spent several days on the likely routes that Gessler would have taken through the Sepulveda Pass on her way home. The Pass cut through the Santa Monica Mountains. While the south slope offered few choices besides the 405 Freeway and Sepulveda Boulevard, the northern slope offered a network of shortcuts pioneered over fifty years of rush hours. Agents traveled all of these roads looking for witnesses to an accident involving a blue Ford Taurus, an accident scene that might have seemed routine but was actually the abduction of a federal agent.

They got nothing.

The Sepulveda Pass had been the location of similar crimes in the past. The son of popular entertainer Bill Cosby had been robbed and murdered on the dark side of the road one night just a few years before. And over the last decade a handful of women had been abducted and raped, one of them stabbed to death, after pulling off the road when their vehicles were rear-ended or became disabled. These incidents were not thought to be the work of one person. But rather that the Pass, with its hillsides, dark, winding roads and anonymity, was a place that drew predators. Like lions keeping watch on a water hole, the human predators would not need to wait long in the Sepulveda Pass. The cut through the mountains was one of the busiest traffic corridors in the world.