Hoda Kotb

Their mother had been abducted.

Two days later, Savannah and her siblings made their first public plea.

Our mom is our heart and our home.

See it.

Investigators put out a timeline.

Nancy had been dropped off at home at about 9.50 p.m.

Saturday, January 31st.

The next morning, at 2.28 a.m., her pacemaker disconnected from an app on her cell phone, suggesting that that was around the time she was taken.

In the days that followed, notes demanding payment were sent to media outlets.

The ransom notes or ransom requests came.

A lot of people wondered, are those true?

Did you believe those to be real?

No response came.

But on day 10, the investigation made a leap forward.

Authorities were able to recover footage from Nancy's doorbell camera.

Chilling images of a masked man trying to obscure the lens.

In his waistband, a gun.

Tell me what you thought when you saw those images of the person who took your mother.

I mean, it's just absolutely terrifying.

Investigators are gleaning every clue from that video that they can.