The picture was gray and milky and the detail definition was soft, but the clarity was completely adequate. The camera showed the whole square area from behind the secretary’s head. She was at her desk, on the phone. She looked old. She had white hair. Stuyvesant’s door was on the right of the picture. It was closed. There was a date and time burned into the picture at the bottom left. Froelich hit fast wind and the motion sped up. The secretary’s white head moved with comical jerkiness. Her hand batted up and down as she finished calls and fielded new ones. Some person bustled into shot and delivered a stack of internal mail and turned and bustled away. The secretary sorted the mail with the speed of a machine. She opened every envelope and piled the contents neatly and took out a stamp and ink pad and stamped every new letter at the top.

“What’s she doing?” Reacher asked.

“Date of receipt,” Froelich said. “This whole operation runs on accurate paperwork. Always has.”

The secretary was using her left hand to curl each sheet back and her right to stamp the date. The tape’s fast motion made her look frantic. In the bottom corner of the picture the date held steady and the time unspooled just about fast enough to read. Reacher turned away from the screen and looked around Froelich’s office. It was a typical government space, pretty much the civilian equivalent of the offices he’d spent his time in, aggressively plain and expensively shoehorned into a fine old building. Tough gray nylon carpet, laminate furniture, IT wiring routed carefully in white plastic conduit. Foot-high piles of paper everywhere, reports and memoranda tacked to the walls. There was a glass-fronted cabinet with a yard of procedure manuals inside. There was no window in the room. But she still had a plant. It was in a plastic pot on the desk, pale and dry and struggling to survive. There were no photographs. No mementos. Nothing personal at all except a faint trace of her perfume in the air and the fabric of her chair.

“OK, this is where Stuyvesant goes home,” she said.

Reacher looked back at the screen and saw the time counter race through seven-thirty, and then seven-thirty-one. Stuyvesant stepped out of his office at triple speed. He was a tall man, wide across the shoulders, slightly stooped, graying at the temples. He was carrying a slim briefcase. The video made him move with absurd energy. He raced across to the coat rack and took down a black raincoat. Hurled it onto his shoulders and raced back to the secretary’s desk. Bent abruptly and said something and raced away again out of sight. Froelich pressed the fast wind button harder and the speed redoubled again. The secretary jerked and swayed in her seat. The time counter blurred. As the seven turned to an eight the secretary jumped up and Froelich slowed the tape back to triple speed in time to catch her opening Stuyvesant’s door for a second. She held on to the handle and leaned inside with one foot off the ground and turned immediately and closed the door. Rushed around the square space and collected her purse and an umbrella and a coat and disappeared into the gloom at the far end of the corridor. Froelich doubled the playback speed once again and the time counter unspooled faster but the picture remained entirely static. The stillness of a deserted office descended and held steady as time rushed by.

“When do the cleaners come in?” Reacher asked.

“Just before midnight,” Froelich said.

“That late?”

“They’re night workers. This is a round-the-clock operation.”

“And there’s nothing else visible before then?”

“Nothing at all.”

“So spool ahead. We get the picture.”

Froelich operated the buttons and shuttled between fast-forward with snow on the screen and regular-speed playback with a picture to check the timecode. At eleven-fifty P.M. she let the tape run. The counter clicked ahead, a second at a time. At eleven fifty-two there was motion at the far end of the corridor. A team of three people emerged from the gloom. There were two women and a man, all of them wearing dark overalls. They looked Hispanic. They were all short and compact, dark-haired, stoic. The man was pushing a cart. It had a black garbage bag locked into a hoop at the front, and trays stacked with cloths and spray bottles on shelves at the rear. One of the women was carrying a vacuum cleaner. It rode on her back like a pack. It had a long hose with a broad nozzle. The other woman was carrying a bucket in one hand and a mop in the other. The mop had a square foam pad on the head and a complicated hinge halfway up the handle, for squeezing excess water away. All three of them were wearing rubber gloves. The gloves looked pale on their hands. Maybe clear plastic, maybe light yellow. All three of them looked tired. Like night workers. But they looked neat and clean and professional. They had tidy haircuts and their expressions said: we know this ain’t the world’s most exciting job, but we’re going to do it properly. Froelich paused the tape and froze them as they approached Stuyvesant’s door.

“Who are they?” Reacher asked.

“Direct government employees,” Froelich said. “Most office cleaners in this city are contract people, minimum wage, no benefits, high-turnover nobodies. Same in any city. But we hire our own. The FBI, too. We need a high degree of reliability, obviously. We keep two crews at all times. They’re properly interviewed, they’re background-checked, and they don’t get in the door unless they’re good people. Then we pay them real well, and give them full health plans, and dental, and paid vacations, the whole nine yards. They’re department members, same as anybody else.”

“And they respond?”

She nodded. “They’re terrific, generally.”

“But you think this crew smuggled the letter in.”

“No other conclusion to come to.”

Reacher pointed at the screen. “So where is it now?”

“Could be in the garbage bag, in a stiff envelope. Could be in a page protector, taped underneath one of the trays or the shelves. Could be taped to the guy’s back, under his overalls.”

She hit play and the cleaners continued onward into Stuyvesant’s office. The door swung shut behind them. The camera stared forward blankly. The time counter ticked on, five minutes, seven, eight. Then the tape ran out.

“Midnight,” Froelich said.

She ejected the cassette and put the second tape in. Pressed play and the date changed to Thursday and the timer restarted at midnight exactly. It crawled onward, two minutes, four, six.

“They certainly do a thorough job,” Neagley said. “Our office cleaners would have done the whole building by now. A lick and a promise.”

“Stuyvesant likes a clean working environment,” Froelich said.

At seven minutes past midnight the door opened and the crew filed out.

“So now you figure the letter is there on the desk,” Reacher said.

Froelich nodded. The video showed the cleaners starting work around the secretarial station. They missed nothing. Everything was energetically dusted and wiped and polished. Every inch of carpet was vacuumed. Garbage was emptied into the black bag. It had bellied out to twice its size. The man looked a little disheveled by his efforts. He pushed the cart backward foot by foot and the women retreated with him. Sixteen minutes past midnight, they backed away into the gloom and left the picture still and quiet, as it had been before they came.

“That’s it,” Froelich said. “Nothing more for the next five hours and forty-four minutes. Then we change tapes again and find nothing at all from six A.M. until eight, when the secretary comes in, and then it goes down exactly as she and Stuyvesant claimed it did.”

“As one might expect,” said a voice from the door. “I think our word can be trusted. After all, I’ve been in government service for twenty-five years, and my secretary even longer than that, I believe.”