"So you mean to tell me that this huge, international crime syndicate went underground because someone found an old typewriter?"

Jane ran her hand through her dark hair as she paced the room. Harriet had been taken to the hospital, and samples taken to the lab by the forensics team to try and find out what she had been poisoned with.

"Possibly. I don't know yet."

Maura turned and looked around the room, realising that herself and Jane were finally alone for the first time.

"Jane… I know we said we were going to have some space. But I can't do this without you. You… you're so important to me. I… Please don't leave me."

Walking over, Jane took Maura's hand and rubbed it gently. "I won't. I'm here. We'll find him, Maura. Together. Like we always do."

Nodding, Maura leaned into Jane's shoulder and closed her eyes. Taking a deep breath, she felt her muscles begin to relax. "I can't do this without you" she whispered, feeling Jane's strong hand rub gently up and down her back.

"Ladies" Detective Greenly's voice forced them apart. "There's something you need to see."

/

The cellars under Victoria College were damp and cold. Aside from one narrow, stone stairway there was no other way to enter or leave the space.

"Over here". Detective Greenly flashed his torch around the dark room, until the light landed on a black box with a red, blinking light.

"What is it?" Jane asked, walking over to it.

Looking closely, Maura nodded to herself. "I think I know. I think someone knew what Kaplowitz was up to. This is a device set up to record signals between teleprinters. If it works, and if the signal can reach through to the next floor, this box should give us evidence of all communications between the Mercurius machine upstairs and the other one, wherever it may be."

"So we've got him?" Jane asked.

"Well, we'd have to prove Kaplowitz was using the machine upstairs and we've got to find the other. We have no concrete link between Kaplowitz and any criminal activity, nor do we have any proof that he killed Rachel, Martin or Harriet." Detective Greenly answered.

"Let's get to work, then" Jane suggested, smiling genuinely across at Maura, who was still nervously wringing her hands.

/

The bright lights of the Oxford Police crime lab were a stark contrast to the dank chambers of Victoria College. Jane's eyes took a moment to adjust as she walked through the doors to watch her friend at work.

"This feels familiar" Maura commented as Jane entered the room. "Just like old times."

Jane smiled, pulling on a pair of gloves and walking towards the machine in the middle of the table.

"Greenly's guys are searching for a link between Kaplowitz and any of the crimes. They're waiting on tox still, but as soon as they get the report he's promised that he'll bring it to you."

Maura didn't answer. She was too engrossed in the task at hand; carefully examining the recording device they had found.

"It operates on radio signals, like all of the Bletchley machinery did, but this is much smaller. Much newer." Turning the box over, Maura nodded at what she found.

"Very clever."

"What is?" Jane asked, feeling herself getting impatient.

"Well, technology has moved on quite a lot since the 40's. The Bletchley machines were manned 24 hours a day, with every communication logged by hand in German, then transferred out to be translated before it was passed up the chain of command. Whoever left this… device couldn't have been there all day without being noticed. So they used an SD card."

Jane watched as Maura pulled out a black card from the side of the machine. "Brilliant."

Walking over to one of the computers, Maura passed the card to a technician and watched as he opened the files.

"Can you print that for me?" She asked, leaving the rest of the job in the capable hands of the crime lab.

/

"It's Morse code" Detective Greenly exclaimed as Maura presented him with the communications they had found. "Of course."

"Can you read it?" Jane asked. The detective took a moment to look and shook his head. "I can slowly. But this is beyond me."

Both of them turned to face Maura. "Well, Dr Smartypants. I bet you can."

Maura nodded meekly, looking up at Jane before taking the paper back from the detective. "I… I can. And I have to say that, with no offense meant, Detective Greenly wouldn't have been able to translate it anyway."

Both Jane and Detective Greenly stared in confusion at Maura.

"The messages are in Serbian."

Sitting at a chair, with a pen and paper in hand, she began to translate. First from Morse Code into Serbian, and then from Serbian into English.

"Deposit goods tonight. 6 Pontius Avenue."

Looking up, Maura watched as Detective Greenly put the pieces together in his mind. "That's Martin Richards' address. What else?"

"2340. Schipol. Delivery received."

"In The Netherlands? Okay."

"1800. Naples. Ferrichi. Terminated."

Detective Greenly shook his head. "Armando Ferrichi. Italian Ambassador for Serbia. He was shot in the head."

"Maloney. Terminated. Milton."

"Shit."

"Morgan. Terminated."

"Well. There we have it." Detective Greenly picked up the papers Maura had translated. "I'm going to scan these in and send a copy to the task force. You've done an incredible job. Thank you."

Maura nodded as the man took the papers and left the room.

"So do you think Rachel left the box down there?" Jane asked. Maura shrugged.

"I've ordered prints. We should know soon."

"I think we need to go back over everything. There's a connection somewhere between Kaplowitz and everything else. It might make him easier to find."

Maura nodded. "We? Together?"

Jane nodded, her hand resting on the small of Maura's back, guiding her out of the crime lab.

"Together."