Title: Serial Game Killer

Pairing: Mac Taylor & Maddie Carson

Rating: T

A/N: This is a crossover with a video game. Own nothing apart from the female character...

Summary: A serial killer on the loose in New York and the motive is unclear, can Mac and the team find the killer before the next kill?

Chapter One

Manhattan had a serial killer on the loose and had been killing for the past two weeks and there seemed to be no end in sight, until the team went to their latest crime scene, it had all the traits of their previous crime scenes and Mac had no idea who they were dealing with, it was something that Mac didn't like one bit and now as he looked over the case file of the latest victim, he wondered what kind of sick bastard could kill like this, it was bad enough that Sinclair was on his ass about the serial killer and Mac knew that they needed to find this asshole before it was too late, as always there was not much in the way of trace.

Mac headed home to his apartment, not knowing what twist the case would take next, he went inside his place where his girlfriend of three years lived as she'd moved in the year earlier and knew that his girlfriend loved playing games and there was a certain game that she loved which happened to be Grand Theft Auto 5 and she had a pretty high rank on the game and as she was playing it when Mac noticed her playiing, he had no idea that the serial killer was someone who played the same game as his girlfriend Maddie and she'd been playing this game since she first bought it when it came out a few months earlier and she loved the high speed chases and owning fast cars that she had in her garage.

Mac watched as Maddie played the game and she had got her own private crew who she was the boss of and she knew just how much fun she had in the game, she noticed how distant Mac was on this night and she wondered if she should ask him outright about what was wrong but she didn't know what his answer would be if she were to ask him about what was on his mind, she allowed him to be close as he watched her play the game and he watched as she recieved a message from a player, as Mac saw the message and it was quite nasty.

Maddie ignored the message as she went back to playing the game, when another message appeared, stating that she was next in line to be harmed, it scared her, even Mac noticed how threatening it was and she didn't know what to do next, neither did Mac and he just wrapped both arms around her while holding her close to him, knowing that she needed him to protect her from the attacker who was now gonna hunt Maddie down and kill her.

Mac took the name of the message ID down on paper, hopeful that it could be traced, before Mac loses the love of his life and he would never forgive himself if something happened to Maddie and he loved her so much and knew how she meant to him, she was his girl and always would be, it was part of the promise that she made him when they started seeing each other and it evolved into so much more and Mac was glad he had met her and fallen in love with her, she was everything to him and so much more.

Not knowing when the killer would strike next and Mac was worried about Maddie and knew that he didn't want to lose Maddie as he would not be able to forgive himself if he lost her, he loved her so much and trusted her, he needed her more than anything and this was something that he knew scared her and even him too, he had to find this asshole once and for all.

Mac sent the info to Adam and see what he could find out, but Mac hadn't mentioned where he got the information from as he had kept his three year relationship with Maddie a secret as he wanted to have a private life outside the lab and so far he had kept his life with Maddie a closely guarded secret and knew that he had to find the killer before Maddie gets hurt, he advises Maddie to write the messages on paper as proof of the threats and Maddie agrees to do that for him, he gives her a soft loving kiss on her forehead.

Maddie put Grand Theft Auto 5 on as she kept note of the messages that the killer sent her and she would let him see them later after shift and she kept note and she was sent a rather nasty message and this was one aimed at Mac and as Maddie wrote it down and showed it to Mac, it sickened him and he noticed how much this message effected her and he wrapped both arms around her and held her close, he knew that she needed him to keep her safe.

What happens next?