One way or another, I’ve spent a lot of time in police stations. New or old, there’s a sameness about them; they’re just like schools and hospitals, in that respect.

There wasn’t a good place to stow my dripping umbrella, so I had to carry it with me. It sprinkled raindrops all over the floor, and I knew the janitor would have a lot to do today. The Latina behind the counter was thin and muscular and all business. She used an intercom to call Detective Flemmons, and I didn’t have to wait more than a couple of minutes until he appeared.

“Good morning, Miss Connelly,” he said. “Come on back.” He led the way into a warren of cubicles created by chest-high partitions, the kind with carpeting on them. As we went past, I noticed that each cubicle had been decorated to suit the person who used it. All the computers were dirty: smudged with fingerprints, their screens so dusty you had to peer at them to read the type. A hum of conversation hung over the bullpen like a cloud of smog.

This was not a happy place. Even though law enforcement people usually thought I was a fraud and a con, which meant that often I didn’t get along with them individually, in the abstract I thought it was wonderful that anyone would choose to do this job. “You have to listen to people lie all the time,” I said, following this line of thought. “How do you stand it?”

Rudy Flemmons turned to look back at me. “It’s part of the work,” he said. “Someone’s gotta stand between regular people and bad ones.”

I noticed that the detective didn’t say “good” people. If I’d been a cop as long as Flemmons had, I wondered if anyone would seem truly good to me, either.

There was a sort of conference room at the end of the cubicles, with a long table surrounded by battered chairs. Video equipment was set up at one end. Flemmons darkened the lighting after I sat down, then he pressed a button.

I was so tense I felt like the room was humming. I stared at the screen, afraid I would miss something.

In the next minute, I was watching a woman who seemed to be in her late twenties or early thirties walk across a parking lot. Her face was not clearly visible. She was partially turned away. She had long blond hair. She was short. Her build was compact. I put my hand over my mouth so I wouldn’t speak until I was sure about what I was going to say.