Listen to "Who You Really Are," from the Sherlock Season 4 Soundtrack. Pretty please. SEASON FOUR SPOILERS AHEAD.

"Where is she?"

"Go to the nearest hospital," a soft woman's voice said, "room 221."

"HALF OF YOU COME WITH ME," he yelled while going on the walkie talkie and alerting Mycroft of his call.

"What did the voice sound like?"

"It was a woman clearly," he began, "and she sounded soft but creepy."

"Hypnotizing?"

"Yes-"

He suddenly heard Mycroft hang up.

"I'm calling Sherrinford."

Sherlock, with a shock blanket around his neck around him along with John, Eliza, and Thomas.

"Her and I made a deal," Eliza said to a cop, "she knew this time would come and she made me promise to chose them over her. She made me," she repeated tearing up.

Sherlock meanwhile just looked at the building where it all began.

For a moment, he doubted her.

How could he have doubted her?!

He then quickly stood up as Lestrade came to him.

"Someone took her," he said.

"Who?!"

"She's at the hospital. You stay here. I'll-"

"No I'm coming with you."

"Sherlock-"

"She's my daughter Greg."

Greg looked at him for a moment.

"Fine, lets go. You too Thomas."

Thomas' sad eyes looked up for a moment still trying to cling to hope that she was still alive.

Thomas and Sherlock looked at each other and nodded.

"Play," a voice echoed along with some beeping, "play."

Her eyes went to darkness until she saw her old childhood flat again.

"Play," a younger but still adult Sherlock said sternly.

She looked at a nearby wall mirror. She looked younger too. Much younger.

"PLAY," an unrecognizable female voice yelled.

Her eyes went wide open and she gripped the violin in her hand.

The walls were whiter than her face along with her dress gown and her blankets.

The woman, with long black wavy hair and ice blue eyes, had another violin, similar to the one in her hands propped up on her chin.

"I want to play something of yours, with a hint of a duet in the beginning of course. That's the least you could do for me."

She looked at the wires connected to her body, deducing she was more drugged up then she thought.

Not questioning her, since she did save her life, she played the duet with her.

As Sherlock, Thomas, Greg, and Mycroft went down the thin hallway, they heard the harmony get closer and closer with each of their heart rates becoming faster and faster.

Greg carefully opened the door.

"Oh hello Mycroft, Sherlock," Charlotte said, her eyes red, "this is Eurus. Isn't she nice? She gave me my violin," she said smiling.

She then passed out.

The only thing heard in the silent room was the violin dropping to the floor.