"You really are as brilliant as they say, Mr. Holmes! Nice to meet you. I'm the Doctor, just as you said. You were right. About everything." His face became somber. "Don't tell them what I did. They'll lock me up or something. But I've changed since then. I would never do a thing like that."

"I believe you."

"Good."

"So, what kind of alien are you? And if you don't mind my asking, how old are you? Your body looks young but your eyes look very, very old."

"I'm a Time Lord from the planet Gallifrey. I can travel through time and space in my TARDIS, a time machine. It was supposed to blend in with its surroundings, but it got stuck as a 1960's police box. I stole it (don't tell them that, either) and began to travel in time and space. We swore never to interfere, but I ignored that rule, even then. I was always saving people. Then began the Time War between my people and the Daleks. Things were getting desperate, and soon I had a terrible choice: destroy my people and be forever alone and filled with regret, or let the universe be destroyed."

"And you chose to save the universe."

"Yes. That's why I look so old to you, Mr. Holmes, I've seen terrible things before it was my time. Of course, I am old by human standards. My two hearts have been beating for much longer than one of yours ever would."

"And how long is that?"

"You wouldn't believe it."

"Try me."

"I've lived for 906 years."

"That explains it. I knew you looked old, Doctor."

•••

Lestrade walked in. "You've been an awfully long time. Made any progress?"

"Lots, actually. But I'm not done yet."

"Right then, I'll leave you to it."

"Thank you."

"You were saying, Doctor?"

"Oh, I don't have any more to say."

"What about the crime?"

"What crime?"

"The one you are supposedly a witness to."

"Oh, that one."

"Well?"

"Have you done an autopsy yet?"

"It's probably being done right now." "Look at the results first. You won't believe me else."

"I'll be right back."

"Are you done yet? We want to question him."

"I want to look at the autopsy report."

"You're in luck, it's just been finished. Go that way and you'll find the room. The autopsy report should be in there. Can we question the witness while you're gone?"

"You can try, but I want him again when I get back."

"Got it."