And whether it was already measuring him.
Arjun didn’t sleep that night.
He lay in bed staring at the ceiling, replaying every crime scene in his mind. Every angle. Every detail.
Every cut.
The incision had been precise. Surgical. Made by someone who understood anatomy.
He did.
Before joining the police force, Arjun had studied forensic medicine. He’d dropped out after his father’s death, choosing the academy instead.
He knew exactly where to cut to avoid excessive bleeding.
He knew exactly how to sever the spinal cord cleanly.
He knew because he’d memorized it once.
His breath shortened.
No.
That didn’t mean anything.
Lots of detectives had medical knowledge.
The next morning, he checked the evidence locker.
The scalpel used in the fourth murder had never been found.
But something else had.
Fibers.
Dark blue cotton fibers on the victim’s bedsheet.
Arjun stared down at his own shirt.
Dark blue.
Standard issue plainclothes.
His stomach tightened.
It was coincidence. It had to be.
He requested access to nearby CCTV footage from the night of the fifth murder — footage he hadn’t personally reviewed yet.
He told himself it was routine.
At 2:17 a.m., a figure entered the apartment building.
Cap pulled low. Mask on. Shoulders slightly hunched.
The posture felt familiar.
Too familiar.
The timestamp stabbed at his memory.
2:17 a.m.
He had been home by midnight.
Hadn’t he?
He tried to remember.
He remembered pouring a drink.
He remembered sitting on the couch.
After that—
Nothing.
Just waking up in bed at 6:40 a.m., alarm buzzing.
He fast-forwarded the footage.
At 3:02 a.m., the same figure exited.
Gloved hands.
Calm walk.
Unhurried.
Arjun paused the screen.
Zoomed in.
The figure adjusted their sleeve while stepping into the streetlight.
For half a second, skin showed.
Left collarbone.
A faint crescent.
His hands went cold.
He rushed home.
Checked the laundry basket.
There it was.
The dark blue shirt he’d worn two nights ago.
Washed.
But not by him.
He didn’t remember washing clothes.
He lifted it to the light.
There.
Barely visible.
A diluted stain near the cuff.
Not enough for the naked eye to question.
But enough for someone trained to see.
His training.
His patterns.
His efficiency.
His phone buzzed.
Unknown number.
He answered.
“You’ve started remembering,” Dr. Malhotra’s voice said calmly.
Arjun’s throat tightened. “What did you do to us?”
“To you?” Malhotra corrected gently. “Nothing violent. We simply introduced a variable.”
“What variable?”
“A trigger.”
The word seemed to echo.
“In some subjects,” Malhotra continued, “we implanted a post-hypnotic susceptibility during infancy. A neurological suggestion paired with certain auditory tones. A frequency most people ignore.”
Arjun’s mind raced.
Late nights.
Headaches.
That faint ringing in his ears he’d dismissed as fatigue.
“You’re activating us,” Arjun whispered.
“No,” Malhotra said. “Someone is. I never proceeded past the theoretical stage. But someone accessed the files. They’re testing which subjects respond.”
Arjun’s heart pounded violently.
“Respond how?”
Malhotra’s silence stretched.
“With controlled aggression.”
The room tilted.
“You’re saying I’m a puppet.”
“I’m saying,” Malhotra replied softly, “that your brain may not distinguish between your will and a planted one.”
Arjun’s chest tightened.
Images flooded his mind.
Flashes.
A door opening.
A woman turning in surprise.
A gloved hand over her mouth.
A blade pressing at the base of her skull.
He staggered back as if struck.
The memory didn’t feel imagined.
It felt… owned.
“You see,” Malhotra continued, almost clinically, “the mark wasn’t for tracking. It was for categorization. Group C subjects showed higher neural plasticity. Greater susceptibility.”
“And the others?” Arjun rasped.
“Group A showed resistance. Group B partial response.”
“And Group C?”
A pause.
“Full activation.”
Arjun looked down at his shaking hands.
All five victims.
All had the same mark.
All had been Group C.
They weren’t random.
They were tests.
Someone had activated them.
And he had survived.
Which meant—
He was the most responsive subject.
That night, Arjun locked himself in his apartment.
No weapons.
No keys.
He handcuffed himself to the bed frame.
If it was a trigger, it would happen again.
He would catch it.
At 2:13 a.m., the ringing started.
Low.
Almost beautiful.
Like distant wind through metal.
His muscles tensed involuntarily.
His breathing slowed.
His thoughts blurred at the edges.
He tried to fight it.
Tried to focus on his name.
Arjun Sen.
Detective.
Not a weapon.
The sound deepened.
Something inside him shifted.
A door opening in the dark.
His body moved before his mind agreed.
The handcuffs snapped tight as he lunged forward.
His teeth clenched.
Vision sharpening.
Pulse steady.
Cold.
Efficient.
And for the first time—
He felt it.
Not fear.
Not confusion.
Clarity.
Purpose.
The killer wasn’t a separate personality.
It wasn’t another voice.
It was him.
Just him without hesitation.
The experiment hadn’t created a monster.
It had removed doubt.
Morning came.
The ringing was gone.
His wrists were raw from the cuffs.
The door to his apartment stood open.
He did not remember unlocking it.
But on the table sat something new.
A photograph.
A list of names.
All with crescent scars.
And at the bottom, handwritten:
Subject C-17: Optimal Response. Continue Trial.
Arjun’s subject number.
He stared at it for a long time.
Then he folded the list carefully.
Put on his dark blue shirt.
And stepped outside.
Because now he had a choice.
He could stop the experiment.
Or he could finish it.
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