MI5 Official Secrets.

Head to the National Archives in queue to discover a hidden world of espionage.

In the first exhibition of its kind,

dozens of previously unseen top secret MI5 files are on display,

revealing real-life spy stories more fascinating than fiction.

MI5 Official Secrets is a free exhibition.

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From ABC News headquarters in New York City, this is GMA3.

Big mistake, huge. Do you guys know that scene?

Okay, pretty woman. Hello. She's in the shop. Iconic. I know that one.

Never ask a question on television that people might not know the answer to you. Hi, I'm Rebecca Jarvis.

And I'm Will. I know that answer. I'm a. We're glad you can join us on this Thursday. Yes, yes, yes. Now coming up, our science abuse series, Becky Worley, checks out on-demand testing for your bone density and muscle mass. How a $50 test could answer questions like, is my workout plan working? So I don't have to look at my belt anymore.

Oh, well, that's a good way to look at it. We have a Becky Whirley doubleheader here. She got an exclusive first look behind the scenes at what may be one of the hottest gifts of the holidays Xbox's new handheld device. She was invited into their labs before it goes on sale to see exactly how they developed.

That is a great assignment. Looking forward to that, we have a lot in store. But first, we do begin with an arrest in connection with the disappearances of Kata Scott, the 23-year-old woman who vanished in Philadelphia nearly two weeks ago. Police say a man is in custody on a kidnapping charge,

and Faith Aboube is here in studio with us with more Hill of Faith.

Hi there, Will.

Investigators say they believe that the suspect was the last person

who was in contact with Katea Scott before she vanished,

but they still don't know where she is.

For 12 days, they say she's had no contact with her family,

...