That afternoon, Nadine submitted a formal request to the Dallas County Fair Park Authority for all security camera footage from the livestock pavilion and surrounding structures for the window of 2:30 p.m. to 3:15 p.m. on Saturday. The request was processed in 3 hours, unusually fast because the request was accompanied by a federal records preservation order that the Fair Park Authority's legal counsel had never seen before and did not know how to refuse. The footage arrived on a secure drive at 4:42 p.m. She reviewed it in interview room C with the door locked. 14 camera angles. She started with camera 9 mounted on the south face of the pavilion aimed at the vendor corridor where Emberly had been standing when he was shot.

The footage showed exactly what the witnesses described. Emberly talking to a man in a gray jacket, receiving an envelope, then falling. The crowd scattering. Malik standing still with the handgun at his side. But camera 12 showed something else.

Camera 12 was mounted on the maintenance catwalk above the pavilion's west entrance. A high angle looking east across the fairground.

At 2:43 and 51 seconds, a figure appeared on the roof of the agricultural storage building 212 feet from camera 12's position. The figure was prone. The figure had an object extended forward, long, dark, consistent with a rifle barrel.

At 2:44 and 3 seconds, the object recoiled with a single discharge. The figure retracted the weapon, rose to a crouch, and disappeared from frame within 11 seconds. Nadine froze the image at 2:44 and 1 second. The figure was wearing dark clothing and a balaclava. No identifying features visible at this resolution.

But the roof of the agricultural storage building was accessible only through an interior stairwell that required a maintenance key, a key issued exclusively to Fair Park Authority employees and contracted security personnel. She saved the timestamp. She copied the footage to an encrypted drive she carried in the leather bag, not a department-issued drive, not stored on department servers. And she made one more note in the notebook, a single word underlined, inside.

Wednesday morning before the crack Nadine had been waiting for.

At 9:07 a.m., a black sedan with federal plates pulled into the North Central Division parking lot. A man stepped out, mid-50s, dark suit, no tie, the particular bearing of someone who carried authority so habitually it had become posture rather than performance. He walked into the station, approached the front desk, and said five words, "I'm here for Agent Hargrove." The desk officer blinked.

"We don't have an Agent Hargrove. We have a Detective Hargrove." The man paused. The pause lasted exactly long enough for someone paying attention to hear the word that had been corrected and the word that had replaced it.

"Detective Hargrove, my apologies." He was escorted to the bullpen. Nadine met him at the divider gate. They shook hands, not the handshake of strangers, but the handshake of people who had met before and were performing unfamiliarity for the benefit of an audience.

"Ms. Hargrove, I'm with the Inspector General's Office, following up on a matter related to the HUD audit referenced in your case file. Could we speak privately?" They stepped into the conference room. The door closed.

Captain Seward, who had been standing at the coffee station 12 feet away, watched the door close. His face did not change. But his hand, which had been reaching for a sugar packet, stopped mid-motion and stayed there for 3 full seconds before he completed the gesture. He walked back to his office. He picked up his phone.

He put it down. He picked it up again. He dialed a number he had called twice before in the past 6 months, a number that did not belong to anyone in the department. The conference room meeting lasted 14 minutes. When it ended, the man in the dark suit left without speaking to anyone else.

Nadine returned to her desk. Her face showed nothing. Her leather notebook was open to a new page, but something in the bullpen had shifted. The air had changed the way air changes when a current runs through it that everyone can feel and nobody can name. Cantu glanced at her from across the room.

Pratt, who had been on his phone, set it down and stared at the conference room door as though it might explain what had just happened behind it. Nobody asked. Nobody needed to. The man had said agent. And in a building full of people trained to listen, a single word was enough.

Thursday. 7 days after the shooting, the case that was supposed to close itself had done the opposite.

At 10:15 a.m., Nadine Hargrove walked into Captain Seward's office. She did not knock. She did not wait to be invited. She walked in, closed the door behind her, and placed two items on his desk. The first was her detective shield, Dallas PD North Central Division, badge number 4471.

The second was a credential case. She opened it and laid it flat on the desk so that Seward could read it without picking it up.

Federal Bureau of Investigation, Criminal Investigative Division, Special Agent Nadine A. Hargrove, Public Corruption Unit. The photograph matched. The hologram caught the overhead light and shifted from blue to silver. Seward looked at the credential.