The car drove up to the building and parked right in front of the revolving doors. Lucas and Erin walked up to the doors and entered the building. Just as Tariq had told them, the building was highly guarded. There were guards at the front, security cameras everywhere and just before they entered reception there was a metal detector. Even before the two MI5 agents reached the metal detector, they were stopped by a security guard.

"Only staff and people who made appointments can enter."

"We do have an appointment," Lucas said.

"To see who?" The guard asked.

"John Prince."

"Right, go on through."

Both Erin and Lucas nodded. The two of them walked up to the reception.

"Good morning, sir and madam. How may I help you?" The receptionist asked.

"We're here to see Mr. Prince," Lucas replied.

"I'm afraid Mr. Prince is in a meeting at the moment."

"Tell him it's an urgent matter."

"Mr. Prince has ordered no interruptions. But, once he's finished, I will let him know you're here. May I have your names, please?"

"Guy Gisborne," Lucas told her.

The receptionist indicated with her hand for the two of them to take a seat. She informed him she will let them know when Prince was free. Half an hour later, Lucas and Erin were shown up to the 24th flour where Prince's office was. They noted up here was where the most security was. Even going up in the elevator, there was a presence of bodyguards. But, that didn't surprise them. Prince was worth a lot of money. As they entered the office, Prince stood up from his desk and walked over to them, his hand stretched out when he reached the two MI5 agents.

"John Prince." He introduced himself. "I'm not sure if I've had the pleasure of meeting you two."

"Not in person," Lucas said. "My name is Guy Gisborne and this is my sister, Isabella."

"Well, it's a pleasure. I presume that we've communicated through phone then?" Prince inquired.

Lucas nodded.

"And what can I do to help you?" Prince asked.

"Do you know a man called Kovalevski?" Erin said.

"The name doesn't ring a bell," Prince replied. "What is this about?"

"Kovalevski mentioned to us that he hasn't received the equipment he ordered from you," Lucas answered back.

"And why doesn't this Kovalevski come himself?" Prince said.

"He's tied up at the moment. He's a very busy man." Lucas said.

"Ah, right. But, for your information. I don't know anyone by the name of Kovalevski." Prince told them.

"Well, thank you for your time," Lucas said.

Prince shook the agents' hands. The two of them left the office.

"What do you think?" Lucas asked. "Do you think he knows Kovalevski?"

"I don't know. If he hasn't met any of his contacts through their real names, he wouldn't know about Kovalevski." Erin said.

"That's true, but why would he uses aliases if he didn't know their real names?" Lucas said. "I mean he wouldn't actually believe they were their real names, would he?"

"Prince might not, but Kovalevski might," Erin suggested. " Remember what Harry told us about him being diagnosed with psychosis. Maybe his hallucinations are causing him to believe what he's seeing is real. That he's part of Prince's plan to destroy the country."

"That could also be true," Lucas agreed. "But, there is a slight probably with that theory."

"Which is?" Erin inquired.

"We don't even know if Kovalevski is associated with Prince. The names on that list indicate they are associates of Prince. Not Kovalevski." Lucas answered.

"So?"

"So we know that Prince is up to something. I mean, why else would he use secret names?"

Before Erin could give Lucas an answer, one of their phones' rang. Lucas answered the call. It was Tariq.

"Tariq, what have you got?" Lucas asked.

"I've done some more digging into his emails. It would seem Prince has been in a lot of contact with someone called 'Vaisey, Sheriff of Nottingham'. From what I've read from the emails they've exchanged, is that Prince and 'Sheriff of Nottingham' are the main suspects behind this plot." Tariq replied.

"Do we know who this 'Sheriff of Nottingham is?" Erin questioned.

"Yes, we do," Tariq told them. "I traced the IP address of the emails that were sent to Prince. The IP was traced to an apartment block in the Belgravia area, on Wilton Crescent. The apartment is leased under the name of one Nikolay Kovalevski."

"So Kovalevski is a suspect?" Erin inquired.

"Yes, and now one of two main suspects," Tariq told them.

"Okay, thanks Tariq," Lucas thanked him as he ended the call.

"Prince is lying. He does know Kovalevski." He said to Erin. "Now let's see what else he isn't telling us."

Erin nodded. The two of them headed back to Prince's office. But, as they reached the office they found it was empty. Prince was nowhere to be seen and so were his bodyguards. The two of them decided to take the opportunity and have a quick look in his office. Carefully, they pushed the glass door open. Lucas hacked into Prince's computer while Erin rummaged through file cabinets.

"Erin, I think I've found something," Lucas called.

Erin walked over to where Lucas stood.

"Look," Lucas showed her the computer screen. "His agenda for today. Here it says 'Meeting with V and B at 4 pm."

"It's just gone 4," Erin said. "He must be on his way to the meeting."

Lucas nodded. Erin and Lucas headed out of the building. As Lucas drove the car, Erin called Harry to update him on the new leads. Whilst Erin was filling Harry in, Lucas dialed Dimitri and ordered him to find information on who 'V' and 'B' might be. Once they reached HQ, Harry caught them before they even stepped foot into The Grid. Lucas and Erin followed Harry into the debriefing room, where they were met by another person.

"Lucas, Erin, I would like to introduce, Beatrice Weatherford. She's Special Branch." Harry introduced them.

"Special Branch?" Lucas questioned.

"Yes," Beatrice replied. "Special Branch have been surveilling Kovalevski for the past year. We believe he and another suspect is plotting to assassinate Her Majesty. Another detective and I have been undercover infiltrating Prince's inner circle. I've been informed by your boss, that you are up to date about who this second suspect is."

"We are. What I don't get is, how come Special Branch never passed on their suspicions to MI5 when they first began put surveillance on Kovalevski? Why did it take a red alert from the MoD to get us to investigate?" Lucas said, slightly angry about this news.

"Our evidence was circumstantial. We couldn't pass on what we knew to MI5 until we had more proof. That is why we organized an undercover operation." Beatrice explained.

"When you informed me about what you had found at Prince's office, Special Branch was alerted and phoned me. We have been asked by the Home Secretary to cooperate with each other and form a joint operation." Harry carried on. "I want you two to remain undercover and work with Ms. Weatherford."

Beatrice smiles at Lucas and Erin.

"I assume you have cover stories?" Beatrice wondered.

Lucas nodded.

"Right then," Harry ended the meeting. "I will let you get on with your operation."

Harry left the two MI5 agents and Special Branch detective to discuss what information they've had so far.