A/N: Soooo...this is my first fanfic for Criminal Minds and my first fanfic for this account. Going into season 10 of CM and they still haven't put JJ and Reid together so this is what I would like to see happen whilst following canon as best as I can. I want to know what you guys think of this. Updates may be slow but I've written the next chapter as well so if this is well recieved then I'll post the next chapter soon. REMEMBER: this is a JJ/Reid story and they will have their moments. I just required a case to springboard their possible relationship. But I'm trying to follow canon as best as I can so...Also I am not AMERICAN so please excuse my non-American writing (you know I might write apologise instead of apologize)

Disclaimer: Please...if I owned Criminal Minds then I would be figuring out the best way to get JJ and Reid together. Also anything recognisable is also not mine *sigh*

It was seven in the morning when the BAU team was dragged into the briefing room at the FBI Headquarters in Quantico. Everyone cupped mugs of steaming coffee, hoping that the caffeine would wake them up out of their sleepy state.

"Good morning, sweeties." chirped Garcia, whilst handing a copy of the case file to each member. The rest of the team mumbled incoherent words. "I apologise for pulling you out of your warm and comfortable beds at this ungodly hour."

"Garcia, please start before I fall asleep again." said Hotch.

"Right. Sorry." She pointed the remote at the projector and two images appeared on the screen, along with images from each crime scene. "Yesterday morning in New Orleans, there was a hostage situation at the public library where Dylan Coulter was shot dead. Then yesterday evening, Kayla Lee was also shot dead in a similar hostage situation at the city park."

"The male was a 57 year old security guard and the female was a 23 year old retail assistant. Both grew up in New Orleans." noted Morgan, reading the case file.

"Different ages and different backgrounds. Our guy doesn't have a type." said Callahan.

"Garcia, have there been any other hostage situations?" asked Reid.

"I've been searching but I haven't been able to find anything."

"So they were victims of opportunity?" asked JJ.

"It would appear so." said Rossi.

"Woah, hang on Baby Girl. Do we know the type of gun used?" asked Morgan.

"Yes, Honey. Several witness accounts say that it was a revolver."

"So if we know the type of gun, shouldn't there be a bullet? ME report doesn't note any bullet."

"I like the way you think honey but and this is a big but, there were not bullets. Entry wound but no exit wound."

"So we have an unsub who shoots invisible bullets. We need to stop him. Wheels up in 30." said Hotch.

~CM~

"So how is our unsub shooting invisible bullets?" asked Callahan. The BAU team were on the jet, flying to New Orleans, reviewing the case file once more.

"It's been theorised by many that you can make bullets out of materials other than metal. Ice, meat and even gelatine bullets have been recorded." said Reid.

"So we have an unsub who make his own bullets." Rossi concluded.

"Possibly, or he's removing them after shooting." said Hotch.

"Removing a bullet is difficult though." said Morgan. "It's not like the unsub just jabs his finger into the entry hole and retrieves the bullet."

"They could be souvenirs that the unsub collects in order to remember each kill." said Rossi.

"Right. JJ and Reid go to the ME, Morgan and Dave go to the families of both victims and try to uncover any possible information, Callahan you're with me."

~CM~

Hotch and Callahan walked into the New Orleans Police Department, meeting the Detective. The Detective extended his hand. "Agent Hotchner." He said with the slightest hint of a question. Hotch shook the Detective's hand. "Detective Bower. Nice to meet you. This is Agent Callahan."

Callahan shook the Detective's hand. "Detective." She acknowledged.

"This way." Bowen led them down a corridor to a spacious room. "These hostage situations have occurred so fast. We had barely made a scratch for the report for the first incident when we were called to the second one." The room had three clear panels, photos and maps of the local area stuck neatly on each panel. "You guys are set up here. Is there anything I can get you?" he asked.

"No we should be fine." said Hotch.

"We're here to help. I'll leave you guys to it." Bowen said, then left the pair. Hotch and Callahan turned back to face the panels, peering closely at the map where the Detective had placed markers as to where the park and library were.

"The park and library are 4 miles apart. This could mean our unsub's a local." Callahan said.

"He might not have a vehicle which is why his ground area is quite limited." Hotch agreed.

"His choice of victim is strange though. Different gender, different age, different ethnicity. There's not a single thing that links them. Our unsub might just be a paranoid maniac."

"I wouldn't jump to that conclusion yet." Hotch pulled out his phone and dialled Garcia, placing her on speaker so Callahan could hear their conversation as well.

"Office of Unfettered Omniscience – how may I help you, O fortunate one?"

"Garcia, its Hotch and Callahan. Have you found any similarities between our two victims?"

"Sorry to disappoint, but I haven't."

"How about place of employment?" asked Callahan.

"Got it. Dylan Coulter and Kayla Lee both worked at the shopping mall just across the street."

"Thanks Garcia."

~CM~

"Single entry wound through the neck, bursting the inferior vena cava." noted JJ.

"What's official COD?" asked Reid.

"Exsanguination." said the ME. "With our first victim being older, he lost just over 5 pints of blood. Our second victim lost 7 pints of blood."

"Is there anything unusual about the victims?" asked Reid.

The ME nodded. "Both victims suffered from a condition known as metabolic acidosis. Whilst they both received medical treatment for their condition, at TOD, their blood pH was lower than 7.35. I would say that several hours before TOD, something made their blood become acidic."

JJ was peering at the thin lines barely visible on the female victim's wrists and ankles. "Hey Spence, what do you think of these?" she asked the young doctor.

"Background checks noted that Kayla had a failed suicide attempt when she was 15 years old. She slashed her wrists with her father's razor however she was found barely conscious by her mother. She went into counselling after and then nothing." said Reid.

"But these lines are too fresh to be scars from 8 years ago. And it doesn't explain why there are identical marks on both her ankles and wrists."

"They do seem consistent with ligature marks from a very thin rope. Cable ties would make these marks as well."

"So Kayla was abducted then used as a victim in a hostage situation. She's not a victim of opportunity. Our unsub has planned this carefully."

"But what about the first victim? He's got no ligature marks." said the ME.

"He had Type 1 Diabetes, meaning that he had to inject insulin every couple of hours. The unsub could have injected neuromuscular-blocking drugs in previous injection wounds." Reid said.

"But it would have come up on the autopsy report." JJ said.

Reid thought for a moment, placing the pieces of the puzzle together in his head. "Metabolic acidosis. Force the victim to drink something acidic such as vinegar to make the blood acid. Add in a drug and let it get into the blood stream. The acid dissolves the drug away. The unsub would already have had the first victim subdued so he wouldn't require any more drugs. The unsub is using their metabolic acidosis as a forensic countermeasure." Reid said excitedly.

"We need to tell Hotch." said JJ.

A/N: Hey readers...again. Because I have no idea what I'm doing can I ask for reviews? I'm not one of those authors who won't post until I have a certain number of reviews because I am doing this for FUN...but I am a noob at writing CM fanfics so I would like some reviews to help me construct my stories to be more CM-like.