Chapter Text
The tower was quiet.
Not the daytime quiet filled with distant conversations and the hum of machinery. This was the deep kind of quiet that only existed at three in the morning—when even the city outside slowed down.
Inside his room, Steve Rogers slept.
The super-soldier was sprawled across his bed, blankets half kicked aside. The dim glow of the city lights filtered through the tall windows, painting faint silver lines across the room.
He was shirtless, the broad lines of muscle across his chest and shoulders rising and falling slowly with each steady breath. Old scars traced faint paths across his skin—souvenirs from battles past.
Everything was still.
Until the window slid open without a sound.
A shadow slipped into the room.
The figure moved with unnatural quiet, landing lightly on the floor as if gravity barely applied to him. Black clothing clung tight to his frame, face hidden behind a dark mask.
In his hand, a small glass vial fitted with a thin injector.
He paused.
Watching.
Listening.
Steve shifted in his sleep.
The intruder froze.
For a moment the only sound in the room was Steve’s breathing.
Then the figure moved again—faster this time. He crossed the room in the span of a heartbeat and reached the bed.
The injector lifted.
A hand shot up and grabbed his wrist.
Steve’s eyes snapped open.
In the same motion he twisted, yanking the intruder forward and throwing a brutal punch.
The masked man moved impossibly fast.
The punch cut through empty air.
Steve rolled off the bed just as the attacker lunged again, the needle flashing in the dim light.
“What the—”
Steve grabbed the man’s arm and slammed him into the wall.
The drywall cracked.
The intruder twisted out of the hold like liquid, moving with a speed that made Steve’s eyes narrow.
Fast.
Too fast.
The attacker struck, sharp claws of metal or blades flashing across Steve’s chest.
Steve grunted as pain flared. Four thin lines opened across his shoulder and ribs, blood instantly welling against his skin.
“Alright,” Steve muttered, stepping back into a fighting stance. “Guess we’re doing this.”
The intruder came again.
Blindingly quick.
Steve barely blocked the strike, catching the attacker’s arm and driving his knee forward. The masked figure slipped aside again, almost inhumanly agile.
Steve swung.
Miss.
The man flipped backward onto the wall, pushing off it like a spring.
Then he lunged.
Steve caught the wrist.
The injector plunged into Steve’s shoulder.
Pain flared.
“damn it!”
Steve roared and drove forward, grabbing the intruder by the chest.
If the man wanted close quarters-
Fine.
Steve slammed him into the wall beside the bed.
Plaster exploded.
But the intruder twisted again, clawing across Steve’s side before flipping away.
Too fast.
Too precise.
The masked man lunged again for Steve’s throat,
Steve stepped inside the strike.
His fist connected.
Hard.
The intruder slammed into the wall behind him, cracks spider-webbing through the plaster.
Steve didn’t stop.
He grabbed the man by the front of his suit, lifted him clean off the ground and threw him.
The wall exploded outward.
Both men crashed through it into the Avengers’ common room.
⸻
Down the hall, Tony Stark jerked upright in bed.
“What the hell was that?”
Across the tower, alarms hadn’t sounded, but the crash had.
Natasha Romanoff was already moving.
So was Clint Barton.
Bruce Banner nearly tripped pulling on a shirt as he hurried out.
And Thor simply grabbed Mjolnir and ran.
⸻
Back in the common room, debris rained from the shattered wall.
Steve rolled to his feet first.
Blood streaked across his chest from several deep scratches. His breathing was already evening out, the super-soldier serum working fast but the wounds were fresh and angry.
Across the room, the intruder rose in one smooth motion.
Not even winded.
Steve frowned.
“You always break into people’s bedrooms,” he said, “or am I special?”
The man didn’t answer.
Instead he lunged again.
They collided in the center of the room, blows landing in brutal rapid succession, Steve’s strength against the attacker’s impossible speed.
Steve blocked a strike and slammed his elbow into the man’s ribs.
The attacker flipped backward onto the couch, then launched off it straight at Steve again.
Claws raked Steve’s shoulder.
Steve grabbed him mid-strike and drove him into the floor hard enough to crack marble.
“Alright,” Steve grunted, “you’re starting to annoy me.”
Footsteps thundered down the hallway.
The intruder’s head snapped toward the sound.
A second later the Avengers burst into the room.
Tony in partial armor.
Natasha with a pistol already aimed.
Clint drawing an arrow.
Thor lifting his hammer.
Bruce skidding to a halt behind them.
“Cap!” Tony shouted. “You good!”
Then they saw the masked figure.
Every weapon snapped toward him instantly.
The intruder froze.
For the first time, he seemed to hesitate.
Six Avengers.
All ready.
Tony’s palm repulsor powered up with a rising whine.
“Yeah,” Tony said flatly. “You picked the wrong tower.”
For a moment the room held perfectly still.
Then the intruder moved.
Faster than any of them expected.
He sprinted toward the windows and leapt.
Glass shattered as he burst through it.
By the time Clint reached the opening and looked down, the figure was gone.
Vanished into the darkness of the city.
⸻
The room fell silent.
Everyone turned to Steve.
Up close the damage was worse.
Blood ran down his chest and ribs from the claw marks. A cut split his eyebrow. Another bruise was already forming along his ribs.
Natasha stepped forward immediately.
“Steve?”
“I’m okay,” Steve said.
Thor frowned deeply. “You bleed, Captain.”
Steve glanced down at the scratches across his bare chest.
“Looks worse than it is,” he said.
Tony crossed the room quickly, scanning the damage.
“Your room exploded through the wall,” Tony said. “That’s officially my least favorite way to wake up.”
Steve gave a small crooked smile.
“Well,” he said, wiping blood from his eyebrow, “I’m awake now.”
Clint lowered his bow but kept looking at the broken window.
“That guy moved like a damn ghost,” he muttered.
Tony looked up.
“JARVIS.”
The AI responded instantly.
“Yes, sir.”
“How did someone break into my building without setting off alarms?”
A brief pause.
Then:
“I did not detect the intruder’s arrival, sir.”
Tony frowned.
“That’s impossible.”
“There is an additional anomaly,” JARVIS said.
Everyone looked up.
“I detected no heat signature from the individual.”
The room went still.
Bruce blinked.
“No heat signature?”
Natasha frowned.
“That’s not possible.”
Steve had been absently touching his shoulder.
Now his hand stopped.
He slowly looked down.
Just below the collarbone—
A tiny puncture mark.
Barely visible.
Steve’s brow furrowed.
“Uh…”
Tony noticed immediately.
“What?”
Steve rubbed the spot.
Then his expression shifted.
Concern replacing humor.
“…Guys,” he said quietly.
Everyone looked at him.
“I think…” Steve paused.
“…he injected me with something.”
And suddenly the room felt a lot less safe.