"Wait!"

"Yes, Mr. Holmes?"

"Don't call me Mr. Holmes, that makes me think of my brother. Ugh. Just call me Sherlock."

"Sorry, Sherlock. What was it you wanted to say?"

"We already knew the what and the when. We answered the who and the how. But we still don't have the why. Why would the Silence murder these people?"

"Excellent question. Does anybody know?"

"No," said Lestrade. "Enlighten us."

"That's what I'm asking you. Do the victims have anything in common? Anything at all?" Blank stares. "Come on, there must be something." More blank stares.

"Wait, I've got it!" exclaimed Watson. Everyone stared at him. "They all said or wrote something about the Silence. The Silence don't want the secret about them to get out." "Oh, Watson, you're brilliant! Absolutely brilliant!" Sherlock said. Watson beamed.

"Great. Now, I've really got to get going," the Doctor said. "Let me know if you need my help again."

"How will we reach you?" Lestrade asked.

"Sherlock has my number. I'm sure he'd be happy to give it to you if you need it. It's been a pleasure to work will you all. Goodbye, everyone. Oh, and don't try to find out too much about the Silence; that's how the murders started. I'll see you round." He turned away and headed to his TARDIS, which was parked just down the hallway.

"You're gonna love this bit," Watson told Lestrade. The TARDIS faded away as the Doctor left to go on another adventure.