After Carrie Farver drove away from Little Macedonia, Iowa in November of 2012 and never returned,

cops and neighbors alike seemed all too willing to believe that her bipolar disorder was to blame.

She'd had some sort of break with reality.

Of course, they sympathized with Carrie's son Max and her mother, Nancy,

but what could anyone do?

Detective Ryan Avis.

In the small community where she's from,

they all kind of believe that too,

and Nancy never could stand up and argue.

Nancy felt lonely indeed.

Until one day, three years later,

Avis' partner detected Jim Doty knocked on her door.

I was a little bit standoffish because...

Been down that road before.

Yeah.

Finally, he said to me,

well, I want you to know

that I don't think she left on her own.

And I tell you,

my attitude just changed.

It was the very thing

Nazi had suspected from the start.

...