A night early! And I'll be posting another tomorrow! The new reviews and follows are just great guys! I never thought I'd get that with this little story so THANK YOU ALL! I know there's spelling errors and major mistakes but I don't have a beta. I'm just making this up as I go along. Thanks for reading! Oh and Jane drops the f bomb. :)

No matter how rational, or logical, the human brain is a slave to the chemicals that flow through it. A slight imbalance can cause any number of problems. A lack of serotonin causes a person to become a killing machine, with no remorse or recognition. So when Maura jumped back from her desk, she couldn't control the fight or flight response. Chang looked at her startled, but she couldn't blame her for her lack of reaction. The woman couldn't see the contents of the plastic lined box.

"Susie, I need you to get crime scene tape and put it across the doors to my office." The woman backed out with wide eyes, but nodded and hurried from the room. Maura herself went into the morgue and grabbed the phone on the wall. Punching in Jane's extension she listened to the rings, glancing at her office.

"Rizzoli."

"Jane, you need to come down here."

"Maura! I got this letter.." The doctor cut her off.

"You need to come down here now." Maura hung up the phone with shaking hands and glanced up to see Chang had taped off the outer doors to her office and was now coming into the morgue. She grabbed the end of the tape and fastened it to the door as her tech cut and taped the other.

"Dr. Isles, what's going on?"

Maura held up her hands, motioning for silence. "I need you to get a camera, and evidence bags. Keep it quiet for now."

The blonde trusted Susie to do that. Chang may be quirky, but she was trustworthy and smart. She'd do what Maura asked without question. The door had no sooner closed than she could hear Jane's heavy steps headed her way. The detective always seemed to burst into a room, but this seemed an explosion. Her dark eyes found her immediately, and long legs had Jane in front of her in seconds.

Maura gripped Jane's hand, "My office is a crime scene."

"Maura, are you ok?" Jane leaned down trying to catch the doctor's eyes. "Was someone in here?"

"No, no one. Some one sent me a human heart."

Normally, this really wouldn't be a surprise for Jane. People sent Maura body parts all the time, she was the Chief Medical Examiner. She'd left a severed head in a hotel freezer, and thought nothing about it. This wasn't normal. Maura's grip was tight and shaking.

"It's in a box on my desk. There's a damn heart on my desk."

Jane wrapped her hand around Maura's waist and pulled her into her shoulder. "Ok, it's ok."

The morgue doors opened again admitting Korsak and Chang but Maura just let her head rest against Jane, taking the comfort her detective offered. Korsak made his way over to Maura's office and peered over the tape. He motioned for Chang to start taking pictures, and turned to the women. "Doc, are you ok?"

Maura stepped back from Jane, squeezing her hand before letting go to turn to Korsak. The concern on his face was clear, and she loved him for it. He reached out and patted her shoulder, giving her a small smile. "What's going on? Jane burst out of the bullpen like she was shot from a cannon."

Maura moved toward her office, slipping on a pair of gloves, and she took a deep breath. "I got a package in the mail. It looks like it was delivered by courier. I didn't get a good look, but it's a human heart." Her voice grew stronger as spoke.

Slipping under the tape she heard Jane and Korsak follow her. Chang had finished her pictures and was looking into the box from a few steps back. Jane watched the doctor closely and saw that her sharp mind had already started to classify this as just another crime scene, another mystery to solve. She didn't know if that was a good thing or not.

Jane snapped on her own gloves and stepped up to Maura's desk. Plain wrapping paper, plain box, nothing traceable there. It was lined with plastic to keep it from leaking, and inside, as Maura had said, there was a heart. She could understand why the blonde was upset when she first opened it. There were no markings as far as she could see that would warn a person of it contents. The detective knew that wasn't normal when Maura received an organ or body part in the mail. By courier or otherwise.

Chang had disappeared from the office, coming back with a tray just as Maura was reaching into the box to pull the heart out. She set it gently on the tray. "Susie please take that to the exam table. Then tell the techs that the morgue and my office are off limits. Only you goes in or out."

"Yes, Dr. Isles."

"There was no return address."

Jane grabbed an evidence bag for the plastic lining the package. "Yeah, I got a letter this morning. Had a picture of a dead woman, and a little message. Apparently the same person who killed Krantz, didn't stop there. There was no return address, and nothing that could identify where it was sent from."

Maura looked up at her startled, and furrowed her brow. "I'm..."

The detective held up her hand and gave the blond a reassuring grin. "I get it. This is a bit of a bigger deal."

Lifting out the plastic, hazel eyes scanned it before putting it into the evidence bag. "There's more in here."

Jane handed her evidence bag to Korsak and reached in for the folded piece of paper. She unfolded it carefully, setting it down on yet another evidence bag on the desk.

'Pleasure in the job puts perfectioin in the work.'

"Sick fuck."

"It's Aristotle. He's quoting Aristotle."

She put the note into the bag then turned to Maura. "It doesn't matter. I know you don't like assumptions, but this has to belong to the woman in the picture."

"I'll know more once I examine it. There are differences between the male and female heart." Maura snapped off her soiled gloves and put them in the trash heading toward the morgue. Shooting Korsak a look she followed after the doctor.

Korsak made his way quickly out taking the evidence with him. Jane watched Maura quickly make her way to the exam table where Susie left the heart in question. "Hey, Maura slow down. Come on, talk to me for a minute."

The doctor shot her an exasperated look, "He sent it by courier Jane! Like it was some trinket!"

Maura stared at the heart. "If this is your second victim, the faster we know the better."

Jane's own heart broke a little, the look on her doctor's face was fallen, distressed. "You need to stop for a minute. Please. Look, let's go get coffee, let's process this. Your office is a crime scene for at least the next 24 hours. Put that in storage, and come with me."

"Its evidence Jane! I can't just put it in storage."

The detective knew she needed a different tactic. She also knew that Maura was too upset to analyze the evidence in her current state. This had shaken her. Maura was used to things working a certain way. The blonde could compromise, she could be resourceful and innovative with new techniques, but this had thrown a new wrench into her normally well run world.

No matter how much death and destruction Maura Isles saw, she still had a sunny disposition on life itself. "I need to get your statement Maura, and after that I need to get Susie's." Jane rubbed her palms together, "And I just want to make sure you're ok."

She saw the blonde's shoulders slump, and hazel eyes stared at her thankfully. "Ok."