At the Great Intelligence Institute, in the large central hall sat a colossal snowglobe with snow flying inside it. "Danger. Danger," it warned in a deep, menacing voice.

Walter Simeon was sitting at the nearby desk, and he looked up from his work and up at the globe. "What's wrong?" He asked. He dropped his pen, got up from his seat, and walked over to the Snowglobe.

"There is a danger here," the globe said. "An intelligence. An intelligence beyond anything else in this time and place."

The doors to the great hall opened, and a servant ran in. "Sir. There're some people here demanding to see you. A father and son," he told Walter Simeon.

Walter turned around and eyed the servant. "No, callers, not in here," he told him. "Did they leave their names?"

"Sir ..." the servant began, "it's Sherlock Holmes! And his son!"

Walter Simeon looked over at the door in shock. How can that be? Sherlock Holmes was just a character. And he certainly did not have a son.

The doors opened again, and the Doctor entered - wearing a deerstalker hat, a matching cape, a walking stick and an unlit pipe – followed by the Professor, who stopped with his hands in his pockets. He looked around carefully, noticing everything that was there. Everything was normal, except …

"That's not right," the Professor mused, looking at the snowglobe.

The Doctor turned around. "It's a nice office, though. But, you're right. The big globey thing is too advanced for this period." His attention turned to Walter. "Now, shut up, don't tell me. I see from your collar stud you have an apple tree and a wife with a limp. Am I right?"

"No," Simeon answered. "Do you have a wife?" "No."

"Bit of a tree? Bit of a wife? Some apples? Come on, work with me here." "Dad, face it," the Professor said. "He hasn't got any of what you say..."

Walter Simeon stood right in front of the Doctor and said, "I enjoy The Strand magazine as much as the next man, but I am perfectly aware that Sherlock Holmes is fictional. Get out!"

"Do you have a goldfish named Colin?" The Doctor asked the servant again. "No," the servant said.

"Thought not. Now, oooh. I see this is one of your business cards. It says so on the front," the Doctor said, looking around a bit.

"Well, that's one way of getting stuff right..." the Professor noted. "Who are you, and What are you doing here?" Walter said.

"This. Wakey, wakey!" The Doctor exclaimed, whacking the globe with his cane. "That is special equipment. You must step away now."

"We are the Intelligence," the Snowglobe said.

"Ooo. Talking snow. I love new things," the Doctor said. "You are not of this world."

"Takes one to snow one. Right, let's see. A multi-nucleate crystalline organism with the ability to mimic and mirror what it finds. Looks like snow. Isn't snow."

"You must leave here now."

"Shut up; I'm making deductions. It's exhilarating. Now, what are you, eh? A flock of space crystals? A swarm? The snowmen are foot soldiers. They are just mindless predators. But you," the Doctor said, pointing his cane at the snowglobe, "you're clever. You're Moriarty. So, you turn up on a planet. You generate a telepathic field to learn what you can, and when you've learnt enough, what do you do? You can't conquer the world using snowmen. Snowmen are rubbish in July. You'll have to be better than that. You'll have to evolve."

As the Doctor spoke, the Professor saw the servant and knew he would get security, so he waved his hand and locked the doors. The servant came back and tried to get in but couldn't. "Sir!" He yelled through. "It appears to be stuck!"

Walter Simeon tried to help get it open again, and while he did, the Professor looked around his books and notes. He accidentally knocked one off the table, and it landed on an open page with a newspaper cutting titled Tragedy at Darkover House. He bent down and picked it up, starting to read about it. As he read, he muttered aloud, "Governess frozen in Pond." The Professor looked over at his father. "Hey, dad. I think I found something."

The Doctor went over to his son. "What is it?"

"This," the Professor said, showing him the newspaper article.

"Gotcha..." the Doctor said. The two Time Lords knew what the Great Intelligence Institute was planning now. Heading over to the window without the others knowing, they climbed out.

Before the Professor climbed out, he waved his hand, and the doors unlocked themselves again.

The security burst into the room, and the servant, with Walter Simeon, pulled the latter towards him. "Get in here!" Take them downstairs!" But, when they all looked, the father and son were gone. Nowhere to be seen.


That following night, the Doctor and the Professor were at Darkover House. They stared at the frozen pond before the Doctor stepped up onto the ledge and inspected it more.

"Body frozen in a pond. So the snow gets a good long look at a human being, like a full-body scan. Everything they need to evolve. Pond. Good point, Clara," the Doctor mused.

Suddenly, Strax then walked up behind them, followed by Belle. The Professor smiled at her. "What are you doing here?" He asked, and the Doctor turned around.

But, before Belle could answer, Strax spoke first.

"Madame Vastra wondered if you needed any grenades," he answered.

"That's, um … That's why," Belle said, pointing at the Sontaran. "She said help. Not grenades." "Help?" the Doctor asked. "Help for what?"

"Your investigation," Strax answered.

"Investigation? Who says we're investigating? Do you think I will start investigating because I have become curious about some bird? Who do you think I am?"

But Strax, not knowing rhetorical questions, answered him. "Sherlock Holmes." The Doctor was having none of it. "Don't be clever, Strax. It doesn't suit you." "Sorry, sir."

"I'm the clever one. You're the potato one."

"Yes, sir."

"Now go away."

"Yes ... Mister Holmes," Strax said as he walked away.

"Oi! Shut up. You're not clever or funny, and you've got little legs!" The Doctor shouted back.

While the Doctor and Strax spoke, Belle looked behind them at the house and saw the light coming from a window. She looked closer and saw Clara. Belle turned around and got the Professor's attention. "Look," she whispered, pointing in the direction of the window.

The Professor turned his head and smiled when he saw Clara. He waved, and she waved back. Clara gestured for the Professor to come up, and he used his hand to say he'll be there in five minutes before watching Clara retract from the window. Then, he started to leave the pond. "Let's go, Dad."

"Why?" the Doctor asked once his son got his attention.

"I may have told Clara we'll be up there in five minutes," the Professor said, somewhat sheepishly.

The Doctor sighed before the three of them – him, the Professor and Belle – turned to leave. However, as they did, no one saw the crack forming in the pond, with a hand coming to rest on the underside of the ice.