The volunteers are marching off our second-largeria search.

They are members of a club. No one wants to join.

It only takes an instant for your entire world to change.

We're talking about the families of missing persons.

Sometimes I'll hear music that'll make me think about him.

And, you know, the tears just flow. I really miss him.

Now, maybe you can help bring their loved ones home.

In each episode, we'll focus on one missing person's case.

Listen closely, because one small detail could make all the difference.

They described a mid-teen Native American female with dark, wavy hair,

with either blonde or orange highlights in it.

They saw somebody on the passenger side of the vehicle

before it started rolling unoccupied across the freeway.

There were just a couple blocks from the river,

and Beth used to go down to the river and play with her siblings.

If you think you know something important, investigators want to hear from you.

Somebody somewhere knows what happened.

It's still not too late to come to the sheriff's office.

Tell what you know.

And for the family of a toddler who went missing decades ago,

one hope is that their missing person might be you.

If she was taken to be someone else's child,

...