Depending on the angle, I could just about guess where each camera was mounted, though, in truth, I’d never noticed them before. Both entrances and both exits of the parking garage were covered. There were an additional six cameras anchored at the second-floor level, each one focused on a different line of sight. I followed one shopper from the time she entered the mall off State Street until she turned left into the main avenue and disappeared from sight. Another camera picked her up as she proceeded down the wide walk toward Macy’s and went into the store. None of the pedestrians seemed to have any idea they were being watched.

“These work off coaxial cables,” Maria said. “All of the cameras operate at the same time. By swapping out cassettes, we can capture images twenty-four hours a day over the course of a month. Unless we have reason to keep a cassette, we tape over what we’ve done. Eventually the tapes get worn or the CCTV heads get dirty, and the images end up fuzzy and not much use. After I talked to you, I pulled the cassette from last Friday.”

She turned to her desk and picked up four cassettes. “There’s a VCR next door.”

We went into the next office, which was plainly furnished and looked like it was called into service on occasions when a mall executive was in town and needed temporary space. She pulled up a straight chair for me while she took the swivel chair behind the desk and rolled it closer to the set. The VCR was wired to a small black-and-white television that looked like something right out of the 1960s, the screen small and the housing enormous. She checked the date on the first cassette and slid it into the machine. “You said between five thirty and six fifteen?”

“Roughly. It was five twenty-six when I looked at my watch. That’s when I first saw Audrey slide the pj’s into her bag. She was the older of the two women working the lingerie department. By the time the loss-prevention officer was called and the whole scene played out, I’d say it was closer to five forty-five,” I said. “I could be off. Time gets distorted when you’re caught up in these things. At the time, everything went by in a blur and that’s why I missed the plate number. I was so astonished at what happened I didn’t register much else.”

“I know the feeling. On the one hand you’re hyperaware and at the same time you blank out the details.”

“Amen. I couldn’t for the life of me go back and reconstruct the incident.”

“Don’t I know,” she said. “A foot chase you swear took fifteen minutes turns out to be half that. Sometimes it works the other way.”

With a remote, she fast-forwarded. Date and time stamps sailed along in the upper right-hand corner. It was like watching an old-time movie, people walking herky jerky, cars zooming by so quickly they seemed to leave a trail of afterimages. I was amazed at how much the eye could pick up from that fleeting series of pictures. When she reached April 22, she slowed the stream of images to a more stately pace.

I pointed and said, “There.”

Maria hit the pause button and rewound the tape.

The black Mercedes sedan, which was halfway up the ramp, reversed itself and disappeared from sight. She advanced the film by degrees. The car reappeared and I saw the younger woman hand a ticket to the parking attendant, who ran it into her machine. The attendant verified the time stamp, put the ticket to one side, and waved her on. The younger woman looked left and smiled, smug and self-satisfied. That much I remembered. As the sedan continued up the ramp, Maria paused the tape again, freezing the shot of the rear bumper. The license frame was in view but the plate had been removed.

“Now you know why you missed it,” she said.

“What shitty luck. I thought if I picked up the plate number, someone at the PD might run it for me.”

Maria said, “Let’s look at it again.”

She caught the Mercedes on its way up the ramp. It came to a halt with a flick of her remote and disappeared from sight, reversing down the ramp. We watched it as though it were the slow-motion photo finish of a horse race. “Check the license plate frame,” she said. “Top says, ‘Keep honking . . .’ Bottom says, ‘I’m reloading.’”

She squinted and tilted her head. “What’s that on the right side of the bumper?”

As the car came up the ramp, she stopped the picture midframe. There was a bumper sticker affixed to the right-hand side. I got up and peered more closely, but the picture seemed to dissolve. Both Maria and I backed up halfway across the width of the office space.

She smiled. “That should help.”

“Can you read that?” I asked.