Emma looked at Sherlock, confused. "A murderer just took out a body without us noticing, and you are on your phone?"

Sherlock looked down at his phone while responding. "I'm texting someone."

Emma didn't need to look over his shoulder to know who. "Tell him to come. Maybe he will be able to notice something we don't. It's always good to have some medical expertise on this."

Sherlock looked up from his phone and slipped it in his pocket. "He will be here in five minutes."

"Good. Now, I hate to be a bust, I know you want John to come here, but I think I know where the body is. I also think that since you texted John, you still have to wait for him. I'll text when I find it."

Emma left Sherlock with no time to object, and Lestrade watched as she bumped into him and swiftly power-walked out of the room.

Sherlock, not knowing what to do, slowly turned around to face Lestrade. "He will be here in three minutes."

------------

Emma looked at the American cab driver. Blond hair, blue eyes. What was she doing here driving cabs?

"You know London so well", Emma remarked.

"I have lived here for five years."

"I hope you don't mind me asking, but why did you come here?"

She smiled. "I just love the UK."

Emma smiled because of what she said. "Understandable."

"Well, here's your stop." Emma handed her the money, but the woman decided to tell her something before she left. "Be careful. Crime in this city can get dangerous. You never know who you can trust."

Emma furrowed her brows and got out of the cab. The lady watched her walk into the office building, and then left. Weird.

Emma walked to the front desk where a man was. She tried not to let what the lady said get to her. She looked at the man behind the front desk, he was the only person left, everyone had already went home. Brown hair, brown eyes, average height, medium build, comes from Dublin. No one important.

"Scotland Yard", she said while quickly showcasing Lestrade's badge. "I need to check everything."

He looked up from his desk, realizing someone was in the building with him. "How come?"

"I think there's something from a crime scene here. One of your workers been away lately?"

"Lacy?" he asked, unsure if that was who she meant. The man continued after Emma nodded her head. "She didn't come yesterday or today. She looked on edge."

"Yeah", Emma replied. "Do you mind helping me look?"

"Sure."

The pair walked into every room on every floor, and found nothing.

"The cameras?" Emma asked him.

He led her to a room with a bunch of screens, and they quickly went through a few hours of footage, finding nothing.

"Thanks for your help."

"No problem. If you need any help, just call. My names Sam. If I don't answer, ask for me. You don't know who you can trust these days."

Emma nodded and left. Why was everyone saying that to her? What's going on?

Emma walked out of the building and whistled over a cab. She got in and said her address. Once the man started to drive, she texted Sherlock.

'Didn't find anything. Meet back at my flat so we can talk about everything. Bring John.

-Emma'

She looked up from her phone and saw that the man was looking at her.

"Rough day?"

"Yeah. I... thought I found something, but I was wrong."

They were almost to her flat.

"What's a florist doing working on cases?"

"What?" she must have heard him wrong.

"I said what's a pretty lady like you doing running out of an office building all scared?"

"Oh. I have to say that that's classified. Sorry."

"That's okay." The man kept driving, and stopped at her flat. "I don't need money, it was a short trip."

"You sure?" Emma smiled. "Thanks."

It was all in her head. It must have been. She had just hear wrong, she was just being paranoid. She hasn't gotten enough sleep, she had been working long hours. It all made sense. She would go home, tell Sherlock what happened, and sleep in her warm bed. Everything would be fine.

Emma opened the door and started to get out, but was stopped by the drivers words.

"Just be careful."

She stopped. Stopped everything. Breathing, blinking, getting out of the car. Maybe it wasn't all in her head.

She looked back at the man, to see if she heard him right, but he was looking out the window, waiting for her to leave.

She got out of the cab, ignoring everyone's words. She fumbled to get her key out of her pocket and almost couldn't unlock her front door. She unlocked the door and quickly stepped inside and locked it again. Be careful.

She huffed with her back against the door, trying to process what had been happening. She saw a man in her living room and stopped breathing until she realized who the man was.

"Sherlock! Thank God!" She ran into the living room and saw Sherlock standing beside John. "John! I got so scared!" She dropped her coat and started breathing normally again. "I was getting scared! Everyone was telling me... telling me the same thing over again, but I didn't know any of them. They said things like 'be careful' and 'you don't know wh-who you can trust'."

"I heard that, too", Sherlock spoke.

"They came to you-u you, too? Do you know who they a-are?"

"No one came to me Emma. I just know that sometimes you don't know who you can trust."

Emma looked at John and saw a gun in his waistband. She also saw him glare into the bathroom that was right beside Sherlock. Both of the men were on edge, everyone was on edge. Why?

"Wh-what's go-going on?" She stepped into the washroom and saw Lacy's body. "Oh my God." She stepped out and looked at the two men. She started shaking her head vilently. "You, you don't think I did this...?"

Lestrade and a few police officers came running out of the kitchen and pushed her to the ground, Lestrade placing the cuffs on her. The other police and John took out their guns and pointed them at her.

"Emma Sara Mingrove you are under arrest for impersonating an officer and for the 'strange case murders'." Lestrade bent over and took his badge back from her waist band.

"Sherlock? John?" she looked at the two men pleadingly. Lestrade got her off the ground and started leading her to the front door.

"You never know who you can trust", Sherlock spoke as she left her flat.

Emma sat in the police car with Greg as he brought her back to Scotland Yard. "Greg, you believe me, don't you?" Lestrade looked at the road in front of him, pretending not to hear. "Greg?"

He stopped his car at a red light and looked back at her. He looked at her like he didn't know who she was. "I don't know." He looked back at the lights and pretended not to hear her quiet sobs.