Summary: A double homicide causes a jurisdiction nightmare for the NYPD, the Boston PD and NCIS. Will Beckett, Jane and Ziva and their teams manage to work together despite their personal issues and solve this case before more lives are lost? Multiple x-over. Expect appearances from Castle, Rizzoli&Isles, NCIS and NCIS:LA.

Author's Note: This story deals with four different TV shows. So here's a note on the timeline: The NCIS storyline is set after episode 10x12 Shiva; NCIS:LA after episode 3x22 Neighborhood Watch; Castle somewhere in Season 5, post 5x14 Reality Star Struck but pre 5x15 Target; and Rizzoli & Isles also somewhere in the first half of Season 3 around episodes 3x07 Crazy For You and 3x08 Cuts Like a Knife.

I know that doesn't fit chronologically, but I'm writing this purely for the fun of it and I hope you'll enjoy.

Disclaimer: I don't own anything. No copyright infringement intended.

Like Broken Glass

Prologue

Kate Beckett was having one of the worst days of her life and that was to say something. She spent the early morning hours in the bathroom, staring at nothing in particular, because she was afraid of a teeny tiny little stick. When the precinct called about a new homicide case, Kate almost dropped her phone into the toilet in her hurry to answer it. After taking note of the exact location where her new murder victim or apparently victims were waiting for her, she went about the business of trying to sneak out of Castle's loft without waking him or running into Martha.

Once Kate had reached her car, she felt relief of some sort. But the rush hour traffic quickly did away with that. Having lived in New York almost her entire life, Kate was well accustomed to the streets of the city and knew that driving in them was sometimes a giant pain in the ass. Ever since her time as a rookie, she'd gotten used to it, but today she just didn't have the necessary patience.

Since she wasn't making much headway and she was practically driving right past it, Kate decided to stop at her apartment to change into new clothes. Back at Castle's loft, she hadn't dared to go through the stuff she had deposited at his place for fear of waking him.

Eventually, Kate reached her crime scene, but so did Castle. Apparently, he had woken up shortly after she had left, figured out that there must have been a murder somewhere, called Ryan for the details, and taken a cab. Needless to say that he was annoyed with her for not telling him. Kate ignored him as best as she could and hurried up to reach that yellow police tape that separated her crime scene from the curious bystanders. It seemed like a safe haven to her right now. Considering how much her morning had sucked already, Kate operated under the assumption that it couldn't get any worse.

Unfortunately, she was wrong. Kate had been to hundreds of crime scenes and they more or less all looked the same. But not today.

Today there were more people there than usual and not just outside but inside her crime scene, which would have been a red flag for Kate even under the best of circumstances.

"Hey Espo, who the hell are these people?" Kate asked the Hispanic detective when he walked over to meet her.

Esposito didn't exactly look thrilled either. "Hey, I was just about to call you. Apparently, we have some company."

Usually, Kate would have waited for more information, but she saw that one of the unknown persons was about to touch one of her dead bodies. Immediately, Kate took a couple of steps forward. "Excuse me, this is a NYPD crime scene. I'm going to have to ask you to leave." Considering her mood, Kate thought that to be positively polite.

A woman in a suit with dark curly hair straightened up and looked her squarely in the eye. "Are you the detective in charge here?" she asked.

Kate suppressed a frown and nodded. "Yes, Detective Kate Beckett."

"I'm Detective Jane Rizzoli. Boston PD. This is Dr. Maura Isles, our ME." She pointed to a woman who was dressed like she was going on a date after this. "We're here to take over this investigation."

Kate had expected a lot of things, but this was taking it too far. "I'm sorry, Detective, but this is not Boston. This is New York, which makes this my crime scene. So either you leave now, or I'll have to charge you with tampering with an official NYPD investigation."

"You can spare me the obstruction of justice crap, okay? This is my partner," Rizzoli replied heatedly, pointing to one of the victims, "which makes this my case, and I don't give a damn about which city this is."

"Please excuse her choice of words. We've only just been informed about his death a couple of hours ago," Dr. Isles added in a voice that was surprisingly gentle in comparison to Rizzoli's.

Kate was still considering whether the news that this was a personal loss for Rizzoli was sufficient to excuse her cowboyish attitude when somebody else approached her from the side.

"Excuse me, ladies." It was a good-looking man in his thirties, wearing a black cap and jacket that practically screamed 'federal agent' at Kate. "But since you don't seem to be on the same page about this case, you might want to consider simply giving it to us."

"And who the hell are you?" Kate asked before Rizzoli could beat her to it.

"Very Special Agent Anthony DiNozzo, NCIS."

"Who?" Kate asked, not even bothering to hide her annoyance.

DiNozzo looked a little exasperated, but not surprised by the question. But Dr. Isles spared him the need to answer. "It stands for Naval Criminal Investigative Service."

DiNozzo raised his eyebrows at her. "Wow, I'm impressed. Wait a second, do I know you from somewhere?"

"Uh, no, I don't think so. Surely, I would remember seeing you be…"

"Maura!" Rizzoli snapped to shut the woman up.

Kate used that opportunity to get the conversation back on track. "Navy? Are you kidding me? What would you want with my crime scene?" She couldn't resist emphasizing the possessive pronoun a little more than was strictly necessary.

A woman with the same work attire as DiNozzo but more exotic looks came to stand next to him. "Because fingerprints identify the second victim as Petty Officer First Class Adam Umar," she answered Kate's question, presenting her with something that looked like a portable AFIS scanner.

Kate gritted her teeth. She hated federal agencies and what Castle would refer to as their 'super-cool toys'.

Ryan appeared next to the female NCIS agent and looked apologetically at Kate. "We also found IDs on both victims that confirm their identities."

Castle had been surprisingly quiet so far, probably still sulking, but now he couldn't resist pitching in. "So, we have a dead cop from Boston and a dead sailor murdered in the city of New York, which means this falls in the jurisdiction of three different departments? Wow, this could be awkward."

Kate closed her eyes for a second. This was not awkward. This was her own personal nightmare. God, how much she hated this day and it was only 9 a.m.