Hi Everyone

I would like to introduce you all to another from my AU One Shot Series, I would also like to thank momandwife33 for this prompt.

Oh and for the readers of Champions of Justice - City of Shadows the next chapter should be out in the next few days, I been a little distracted sorry.

Takes placed after 05x21 'Still', But goes AU from there.

I hope you all like this.

Standard Disclaimer: Not mine, Never will be. Belongs to the fantastic AWM and the guys and girls at ABC Studios.

The Castle with Iron Gates

New York City

The city that never sleeps a vibrant everlasting metropolis, The financial centre of the country and a cultural hub for the arts. A city of over eight million people going about their day and nights.

Unknown to the citizens of this city a deranged killer was stalking the streets, However this killer wasn't targeting ordinary citizens. This killer was targeting it's protectors in the last five days four police officers had been gunned down in the street, All killed with the same calibre weapon all killed on bogus emergency calls and ambushed.

The NYPD had reacted with a vengeful fury all tours extended, All Detectives removed from any active cases and everyone pushed into the hunt for this killer.

The 12Th precinct in the heart of Manhattan, Detectives and Officers of the Homicide Department all stood in silence eyes glued to a TV screen.

"We now go live to Cheryl Baker for Channel 7 News, Are you their Cheryl?"

"I'm here John, We are now receiving reports that the 'The Stalker' as the press have dubbed him has struck again. In the building behind me two uniformed officers from the NYPD's 25th Precinct have been shot and killed in an ambush responding to an emergency call"

"Cheryl, Has their been as response from the NYPD in relation to this latest heinous attack against it's officers"

"The NYPD has released a statement Commissioner Jack Reynolds told members of the press just minutes ago and I quote 'That all 35,000 members of his force would be brought into service against this killer. We will not rest until he is brought to justice'.

"Strong words there from Commissioner Reynolds, But do they believe they can catch this killer with just police work"

"We will have to wait and see John, But their in a noticeable police presence here at the moment and that will only increase as this investigation continues This is Cheryl Baker reporting from Manhattan"

"We will keep you apprised of this story as it develops"

Murmurs and chatter filled the bullpen as Captain Victoria Gates marched out of her office, She had only just ended a call with the Chief of Detectives who barked orders he wanted every cop on the street to find this killer.

She climbed a metal chair and stood on a desk and cleared her throat gaining the attention of every cop in the room.

"Ladies and Gentlemen, I have just received mobilisation orders" Gates announced "the Chief of D's wants everyone on the street you are to check in with dispatch every two hours and report any suspicious activity"

At the back of the group stood three detectives and a writer observing the Captain order the room, Richard Castle resident consultant his mind raced with thoughts of killers and clues to find them. The one thought at the front of his mind was that of his Girlfriend Detective Kate Beckett, He knew that as a tough as nails cop she could handle anything but the way this killer was killing cops scared him.

He moved his hand slowly lacing his fingers with her's, Kate smiled closing her hand around his taking in his silent show of strength and support.

They separated at Gates barked their names.

"Beckett, Ryan and Esposito go and hit the street" Gates said getting down from the desk as they others dispersed "Mr Castle I'm sorry but due to the nature of this investigation you'll have to sit this one out"

Beckett went to voice her disapproval but Castle stopped her "No!, Beckett it's OK I'll stay if you leave me everything you have on 'The Stalker' and I'll see what i can find"

Beckett eyed her partner carefully she knew that what he said was the truth. This type of killer was as dangerous as anything they had faced before, At least she knew he would be safe at the precinct and with his keen eye a useful asset.

"Alright Castle, Let me know what you find out" Beckett said grabbing Esposito and Ryan and marching towards the elevator.

Gates looked at the writer happy that he had agreed to her order so readily, When she had arrived at the 12th precinct a year before she had read detailed documents about Detective Beckett's team. A team including the resident author consultant her years as a cop told her this was the most unorthodox team she had ever come across, At first she chose not entertain the idea which she sought through Castle expulsion from the precinct.

However after he had wormed his way back into the team with the help of the Mayor his abilities shone through, His skill in finding the clues that ordinary Detective would not look for and it regularly caught the killers. Thanks to this single team it gave the 12th Precinct Homicide department one of the highest clearance ratings in all of the NYPD.

Something that made Gates very proud.

For what seemed like hours Castle poured over crime scene photographs, lab reports, First responder statements and autopsy findings, He knew the link the story had to be here for the sake of his friends and his love he had to find the killer.

That was when it hit him as he grabbed two lab reports one from this mornings attack ambush, Another from an attack the killed two police officers in their patrol car in Brooklyn two days ago. The reports showed traces of a rock dust found in foot prints at the scene, Known not be the offices involved and with closer inspection he found it was limestone dust.

He slid into Beckett's chair and loaded up an NYPD search engine on her computer, He entered in the search terms 'Limestone' and 'Manufacturing' which brought up a long list of results. Again something caught his eye Limestone was primarily used in the manufacturing of Cement for building and construction, Quickly looking up for closed or derelict Cement Works in New York again brought up a list of results.

There was an old cement works in Brooklyn had been closed just last year due to safety concerns, This must be where the killer was hiding to have this amount of rock dust in his shoes.

He closed the manilla file and marched towards Gates office and knocked the door.

"Sir, I have found something" He said finding Gates behind her desk glasses balanced on the end of her nose.

"Come in Mr Castle, Explain" She ordered

Castle nodded as opened the folder and placed it in front of the Captain as she readjusted her glasses eyes scanning the information as Castle began his explanation "I was pouring over reports from each crime scene and one similarity kept popping up, Dust had been found at every location in footprints and upon further analysis CSU confirmed it was Limestone rock dust. I checked Limestone is primarily used in the production of construction grade cement, I then checked Cement works city wide it showed a Cement works located in Brooklyn that was closed last year due to safety concerns"

Gates nodded all through the explanation of the writers findings, This was a totally solid lead and it was more than they had collected so far on 'The Stalker'

"Good work Mr Castle, Get in contact with Beckett have them meet us their" Gates said standing up from her desk and holstering her service weapon and securing her badge of her hip.

"Your coming Sir" Castle asked surprised

Gates eyed the Writer with trepidation, "Yes Mr Castle if you haven't noticed everyone of my officers is otherwise indisposed"

"Right" Castle responded pulling his phone and calling Beckett.

Minutes later Gates stepped into the elevator as Castle jogged in after her, "Beckett and Boys are stuck uptown something about a traffic light failure in the area it's gridlock" He explained

Gates nodded but remained silent, They were about to enter a Spider's lair now starting to feel like the proverbial fly.

Twenty minutes later the midday sun high in the sky a Black Charger pulled up at the curb the old MacKay Cement Works was in sight, It's chain link fence secured by a heavy bolt and chain as the old works looked abandoned and devoid of people.

Gates pulled her phone away from her ear ending a call "It's seems that ESU is caught in the same gridlock, MTA are reporting a mass failure across it's traffic control network. We are on our own for a while" She explained

Castle nodded nervously he knew they were going to have to enter the building to search it, They couldn't in good conscious let this serial cop killer escape. But it still meant entering the building alone, With back up so far away they might as well be calling from the moon.

"How do you want to proceed Sir" Castle asked swallowing the lump in his throat.

"Are you weapons trained Mr Castle" She asked eye never leaving the target building

The Writer nodded "Yes Sir, On a Glock 17 and a SIG-SAUER 226"

Gates then reached into the glove box and handed Castle a black Glock 17 with a full magazine with a round chambered, "Remember we need this man alive if possible, We don't have time to wait for back-up to arrive we can't let him take another cops life"

Castle nodded nervous energy flowing through his body, He took a small mag-lite from the Captain as they exited the car and stepped across the street towards the empty building.

Unknown they were being watched by a being of pure evil.

Passing through the large gap between the chain link front gate, The Chain loose enough to allow even for someone of Castle's size with very little effort. As the pair approached the main production building it was flanked by tall holding tanks, Castle wrapped one around the handle of the rusting black sliding door and yanked it open the metal protesting due to the rusted sliders at each end.

Gates as the trained officer entered first weapon moving in all directions, The piercing light from her Mag-lite held in the her opposite hand revealing objects previously hidden in shadow. Soon her beam of light fell upon a stack of old cement, The grey powder still contained in it's plastic bags covered in dust and grime. As she lowered her hands she felt something hard impact her face knocking her to the ground, Her gun skitted away as the light from her torch flickered from the hard impact to the floor.

Looming above her a 6ft 2 muscular man with a sickening smile gracing his features, Grabbed her ankle and dragged here away leaving a blood trail in the dust.

Castle his glock aimed forward his own mag-lite illuminating the area in front of him, Slowly walked down an aisle of stacked pallets filled with cement bags stacked high. The area was silent except of the crunch of the rock and dust beneath his feet up ahead he caught sight of a light rolling back and fourth across the floor he advanced quickly and stopped just short.

His eyes widened in shock at the pool of blood and the drag marks in the dust, The Captain was no where to be seen he turned finding nothing nearby killing his light he crouched down to the floor and backed up to a stack of cement. Pulling his phone from his pocket he sent a rapid text to Beckett and boys hoping they could get here in time.

Just before his finger was about to hit send, He heard a click and felt the cold metal of a gun barrel pressed into his neck.

"I wouldn't do that if I were you Detective" A male voice said

Castle didn't dare move but simply let the gun fall from his grasp, His finger holding the trigger guard the gun upside down. The man took the weapon from Castle and ordered him to his feet, The writer complied before his felt and a heavy impact at the back of his neck his vision immediately blacked out as his fell into a state of unconsciousness before crumpling to the floor.

The man simply grabbed Castle by the ankle and dragged him away leaving tracks in the dust, An open area of the held a still unconscious Captain Gates her arms secured to a thick metal chain above her head. Securing Castle in the same manner his arms above his head to the thick metal chain, With a smile he man walked away happy with his latest capture at least this time he didn't have to travel far for his latest act of revenge against the NYPD.

A cop and a writer at the mercy of a deranged serial killer, No help on the way, No change of escape, No chance of survival.

Hopeless.

Hi guys

Again I've decided to split this into two chapters, I know I said one shot but I wanted a cliff hanger (I'm evil i know)

Please let me know what you think, You all know the drill.

Is it terrible, Is it fantastic, Please let me know

Thank you in advance

Knight Rider Alpha