"Mary? What's wrong? Where's Ally?" John asked whilst on the phone to his panicked wife. John hated hearing Mary upset but somehow hated seeing Sherlock upset more. Mainly because it was so rare. Sometimes John thought that Sherlock only looked upset when he thought that he couldn't see him. The thing was, he could see him. He could always see Sherlock. He leant on the wall of a house and slowly slid down to the pavement. He sat there in the darkness. His head was confused. He loved Mary. Of course he did! But Sherlock was still a mystery to him with his cheekbones and his coat collar.

He suddenly felt a tiny drop of water on his hand. Rain. Great. "So she's not with you?" John asked, "No where in the house?" He felt his heart sink as Mary explained the situation to him, "Ok. I'll find her. Don't worry." He said before hanging up.

Sherlock walked round the corner and sat down with his friend. The rain was now becoming a storm.

"Sherlock," John said putting his head in his hands, "she's not there. Ally's not at home. Do you think it was..."

"Yes." Sherlock said sadly. He saw that John was hurt but couldn't comfort him. How could he? His daughter was missing.

Just then, Sherlock received a text. "Hush little baby, don't you cry." Sherlock read out the message.

"Part of a song?" John asked, "Do you think it's from him?" Sherlock said nothing. He didn't need to.

"My daughter." John said breaking the silence.

"Yes."

"Will she be ok?"

"She will be fine. Moriarty may be a psychopathic murderer, but he wouldn't hurt a baby."

"He committed his first murder when he was 11!"

"Like I said. He wouldn't hurt Ally." Sherlock stood up. It was still raining but they needed to find the Doctor. John looked up at him. He stared at his friends curly mop of hair and smiled.

"John, did it occur to you that we have been walking for 59 minutes?" Sherlock questioned.

"Really?" John asked as they walked through the storm. Suddenly, Sherlock received a second text.

"Daddy John is ready to save your life." He read.

"What's that supposed to mean?" John asked.

"Somebody's trying to send us a riddle."

An hour later, the same thing happened. Sherlock received a text from a blocked number. "Hush little baby, just stay here."

"So every hour we get another piece of the puzzle?" John said.

"Apparently." Sherlock replied, "What's the time?"

"4," John answered, "Wait, what? Why is it dark?"

"There are no stars John. This is no normal darkness."

The detective looked up at a block of flats. The windows were wide open. Sherlock had already figured out that there were no people. Why would the windows be open if there was nobody there? Sherlock immediately decided that that was their destination. Before they had reached the door, he noticed something on the floor. A small leather wallet. He picked it up so he could examine it closer.

John was about to push open the door when he turned to look at his friend. Sherlock pulled out a magnifying glass out of his coat pocket. John laughed, "You actually carry one around with you?"

"Shut up!" Sherlock argued, "You carry a notebook around with you." John shut up after that and allowed him to work.

That was the best option.