I'm Lester Holt. Tonight on Date Line, a mother of two vanishes in broad daylight.

And for one detective, it's personal.

Sherry was an extremely devoted mother.

Why would she go missing?

This is the case to go on life with someone.

Because you're newer? Absolutely.

Can't sleep. You can't eat.

It's just worry. Where is she?

We had various witnesses that saw her getting into this car.

Their handcuffs involved, the badge involved.

Something was terribly wrong here.

Who the heck is this woman and what does she have to do with Sherry?

She is not the kind of person to commit any kind of crime.

Something this diabolical had to come from somebody else.

Yes.

There was no escape for her.

Sheer terror from the very beginning.

Here's Josh Mankowitz with the life she wanted.

It all happened so quickly in the parking lot of a target on a bright Monday morning.

A woman was handcuffed, bundled into a car, driven away.

It left behind a mystery that would expose a troubled marriage,

some devious manipulations,

...