A/N: So this is my first fan fiction : ). It's mainly Kate/Jake, but it progresses eventually in the story. The first few chapters are introductory and filler chaps, so bare with me... I've taken a couple of episode from the series, but I've changed the story line a bit (like in this chap it should be Sam but I took Joe instead, you'll get what I mean when you start reading). Hope you don't mind.. Anyways, enjoy : )

Disclaimers: I do not in any way own Law and Order Uk (Unfortunately cos I definiteley would not have put the show on break :(...)

It was a nice sunny morning, contrasting harshly with the disaster in front of him. Detective Seargant Ronnie Brooks sighed, almost 40 years he'd been working for the police force and this was one of the worst wrecks he'd ever seen.

The commuter train was derailed, part of it had been turned over too. Its front was irreckongisable, and the car that had been driven onto the tracks, causing the crash, was completely crumpled. Someone had driven that car onto the tracks, and the train had crashed into it.

Ronnie slowly walked closer to the train. There were so many people around it. Engineers were cutting the car open, looking for the passenger that had driven it. "14 dead till now", Joy, the pathologist, said to her clipboard, while pulling a covered strecher into an ambulance. Paramedics were taking care of the less serious injuries, "...about 120 people were injured..." Ronnie overheard someone say. Uniformed officers were talking to all the people who were on the train, but no one had seen anything. Medical examiners were zipping big black bags around the dead victims, before loading them onto strechers for Joy to take to her lab.

"I need a paramedic, I need a paramedic now!" Ron heard his partner, Joe, call. 2 medics quickly ran towards the direction of his voice, inside the wrecked train. Ronnie followed, in time to see the doctor roughly pulling Joe away from a small boy. Quickly, the doctors started to perform CPR on him.

"Joe.. it's a real wreck out here, ay? Just heard Joy say 14 dead.." Ronnie said gently. Without looking up from the paramedics, who were shaking their heads slowly, Joe replied, "It's 15 dead." Ronnie sighed as he patted Joe's shoulder. The younger detective had just joined the team from the child abuse section, and this was his first case as a detective. His brown eyes were full of sorrow as Ronnie led him away from the boy.

"His name was Max.." he started, but was interrupted by Gary, a lab technition. He waved at them from the front of the train. "Ron! Come and 'av a look at this!"

"Com'on, Joe, let's see if they found the driver of the car. The murderer, one can say.." Ronnie and Joe walked over to Gary. The engineers had managed to saw the car open, but there was on crushed body, as they were expecting. Gary was gently brushing black powder along the stering wheel. "Bingo! Palm print!" he said, and picked it up with transparent plastic.

"But mate, where's the dead driver?" Joe asked, confused. "Aha, DS Hawkings, now that is a very good question. The driver must have exited the car before the train crashed, there's no way he would have survived the crash if he were still in the car.."

Ronnie frowned, and looked over his shoulder. "Well, the only way to get out of this place is that gate over there, but the barber wire on top and the lock show that no one left this scene..." he said, and looked promptly at Joe as if to say, so this means... Joes hesitated for a moment, before saying "...and since officers arrived here, the gates have been guarder, not allowing anyone to exit. Which means that the driver is still here at the scene, mingling with the real victims!"

Ron grinned, "We'll yet make a detective out of you! This is starting to look easy, the person who caused this crash is literally handcuffed to the crime scene, and we 'av his palmprint too! All we have to do is find some suspects.."

"Ronnie, let's start with the passengers who didn't have a ticket. 'Cos the driver wouldn't have a ticket, now, would 'e? " Joe said. Gary interjected, "Simon there is questioning all the people who were on the train..." Ronnie nodded, "Right, com'on Joe. Thanks Gary. Simon?" he called.

"Oh, hiya Ron. I've interviewed quite a few passengers already, till now those 3 were unable to produce a valid ticket." He pointed towards them, a paramedic was bandaging a woman's leg while the other two seemed to be waiting for their turn.

"Brilliant, Simon!" Ron said before heading towards the people. When they arrived next to them, Ronnie gently asked the woman "Goodmoring, how are you doing?" Clearly in shock, the woman started blabbering on how horrified she was at what had happened, how lucky she was to have only a small cut (the cut on her leg was big, jagged and uneven, and definitely not small). She was saying that she must have lost her ticket, which was in her pocket, during the crash, when something caught Joe's eye. The doctor had turned to clean the next person's wounds. She was wiping at a long, even cut on a man's forearm. He narrowed his eyes, it was too clean and even, especially after he'd seen the cut on the woman's leg. The contrast was immense. He nudged Ronnie before speaking to the man.

"Hello, I'm DS Hawkings. What's your name?"

"I'm Finn. Finn Tyler."

"That's a nasty cut you got there."

The man glanced down and uncertainly back up to Joe. "Yeah, a piece of flying glass caught me. Luckily only my arm."

"Well mate, the problem is that that was definitely not cut by flying glass, it's too clean. To would be a jagged and deep cut, like this lady's."

Ronnie added, "That was cut by a blade." He raised an eyebrow, causing even more wrinkles to appear on his forehead. The man looked at the two detectives, his lips quivering.

"Finn?" Ronnie asked. He gave Joe a nod, who said, "Finn Tyler, I'm arresting you on suspicion of 15 counts of murder. You do not have to say anything but it may harm your defence if you do not mention when questioned something which you later will rely on in court. Anything you do say may be given in evidence." He cuffed Tyler while saying it. Tyler looked as though he was about to start crying. "I'm so sorry! I never meant to kill anyone!" he said as the detectives led him away, towards their squad car.