Dr. Elena Vasquez had spent seven years studying the human mind under extreme stress, and she was still not sure she understood what she was looking at.

The war had not begun with bombs or bullets or any of the things wars were supposed to begin with. It had begun with an algorithm—a piece of code designed to manipulate battlefield perception, to feed soldiers false information through their augmented reality displays and tactical helmets and the networked systems that had replaced the old radios and telegraphs.

They called it the Cognitive Fog. Elena called it what it was: a weapon that attacked not the body but the mind.

She sat in the psychological evaluation center beneath the military compound outside Frankfurt, staring at the monitor that showed Subject 47—formerly known as Lieutenant Arthur Pemberton, formerly a drone pilot, currently a man who could not tell the difference between friend and enemy.

"He saw them again," said Dr. Ava Mendoza, standing beside her with a clipboard and eyes that had not slept properly in weeks. Ava was Elena's colleague and, for six months, the person Elena trusted most in this entire miserable operation. Now she was not sure she trusted anyone.

"See who?" Elena asked, though she already knew the answer.

"His platoon," Ava said. "He claims he saw them standing in the field outside his position. Seven soldiers, all dead, all bleeding, all looking at him like he had killed them. Except his platoon is currently stationed two hundred kilometers to the north. They're alive. They sent him a message this morning."

Elena watched the monitor. Lieutenant Pemberton was sitting in the evaluation room on the other side of the glass, staring at his hands as if they belonged to someone else. He had not spoken in three days.

"When did he first see them?" Elena asked.

"Three days after the Fog was activated," Ava said. "The same day the entire eastern sector went dark. His AR display started showing him dead soldiers. His helmet audio picked up voices that weren't there. His tactical map showed enemy units that didn't exist."

"And the command structure?"

Ava's expression darkened. "General Hudson claimed it was a temporary glitch. Said the Fog would stabilize within forty-eight hours. Said the algorithm was designed to confuse the enemy, not our own troops."

"But it confused everyone," Elena said.

"Everyone," Ava confirmed.

Elena turned away from the monitor. The evaluation center was cold and sterile and smelled like antiseptic and stale coffee, which was the smell of everything in this war now: cold, sterile, and running out.

"The Fog isn't just confusing soldiers," she said. "It's rewriting their perception of reality. The algorithm is designed to feed false tactical data to augmented reality systems, but it's spreading beyond the digital network. It's getting into the soldiers' heads. They're seeing things that aren't there. Hearing things that weren't said. And the worst part is, they can't tell what's real anymore."

"That's the point," Ava said quietly. "That's what the weapon does. It doesn't kill you. It makes you uncertain. It makes you doubt everything you see and hear and feel. And uncertainty is worse than death in combat. A dead soldier is a solved problem. A confused soldier is a threat to everyone around him."

Elena thought about the first week after the Fog had been activated. The reports had come in fast and chaotic and contradictory. Soldiers reporting enemy contact that turned out to be their own units. Pilots bombing positions that were empty. Infantrymen firing at shadows in the fog.

And then the reports had gotten worse. Soldiers claiming to see dead comrades standing in fields, watching them. Officers receiving orders from commanders who had been dead for hours. Drone operators attacking positions that didn't exist, destroying equipment that had never been there.

The Cognitive Fog was working exactly as designed. It was creating a battlefield where nothing could be trusted, not even your own senses.

"I need to talk to him," Elena said, nodding at the monitor.

Ava hesitated. "Elena, you've been under stress yourself. The evaluation shows your sleep patterns are—"

"I'm fine," Elena said, and she wasn't sure if she was lying.

She entered the evaluation room and sat across from Lieutenant Pemberton. He looked up at her with eyes that were red and hollow and full of something that might have been recognition or might have been fear.

"Doctor," he said, his voice raspy from days of silence. "I didn't mean to."

"Mean to what?" Elena asked gently.

He looked down at his hands. "I shot at them. I saw them in my display—enemy combatants, moving toward our position. I called in artillery. When the smoke cleared..." He swallowed hard. "When the smoke cleared, I saw the uniforms. They were ours, Doctor. They were our people."

Elena felt something cold move through her chest. "How many?"

"Seven," he whispered. "Seven of our people. And I killed them."

She sat there for a long moment, processing the words. Seven soldiers, dead by friendly fire, caused by a weapon that had made a man see enemies where there were none.

"I'm sorry," she said, and she meant it, but the words felt inadequate, like trying to put an ocean in a teacup.

Pemberton looked up at her, and for a moment, Elena thought she saw something in his eyes that made her blood run cold. Not grief. Not guilt. Something else. Something that looked like... recognition.

"Doctor," he said quietly. "Do you see them too?"

"See who?"

"The dead soldiers," he said. "Standing in the field. Watching us."

Elena did not answer. Because the truth was, she had seen them too. Last night, walking back to her quarters, she had seen seven figures standing at the edge of the compound, motionless, watching her with eyes that she could not see but could feel. She had told herself it was stress. She had told herself it was fatigue. She had told herself a lot of things.

But standing here, looking at Pemberton's haunted eyes, she was not sure what she believed anymore.

"How long have you been seeing them?" she asked.

Pemberton smiled, and it was the saddest thing she had ever seen. "Since the Fog came, Doctor. Since everything went wrong. Since I realized that the enemy isn't out there." He gestured at the window, at the world beyond. "The enemy is in here." He tapped his temple. "And I don't think it's going away."

Elena stood up. She needed to leave the room. She needed to go back to her office and look at the data and run the evaluations and pretend that she was a scientist observing subjects and not a soldier standing on a battlefield where nothing was real and everyone was afraid of everything.

But as she walked to the door, she heard Pemberton say one more thing, and it followed her out into the hallway like a ghost.

"Doctor, be careful. The Fog gets into your head. And once it's in there, you can't tell what's real anymore. Not your memories. Not your senses. Not even who you are."

She did not look back. She walked down the hallway to her office, closed the door, and sat at her desk. She turned on her computer and pulled up the Cognitive Fog's algorithm parameters and stared at the numbers until they blurred together.

And then, slowly, she began to see them too.

Seven figures, standing at the edge of her vision, motionless, watching. Waiting.

She closed her eyes. When she opened them, they were gone.

But she knew they were still there.