Cooper Maul

I couldn't fully understand why they'd be barking up this tree again.

All for America's Most Wanted.

Law enforcement agencies like the FBI and local police send cases to America's Most Wanted because the show is a useful tool for catching fugitives.

That kind of exposure could put Margo's case back on the map again, giving it the kind of national attention it hadn't seen in decades.

And the clock was ticking.

It wasn't much of a family tree to work with.

Talking to a fugitive's family can be a huge help for investigators.

After all, our families often know things like where we might go, who we trust, and how we think.

That emotional connection can also be a weak spot.

People on the run almost always reach out to loved ones eventually.

But it didn't seem like Margo's family knew much about her back in the 70s.

So why would they know anything now?

Costas couldn't leave that to chance.

Costas started knocking on doors, beginning with the Worthington Police Department, where the family name still rang a bell.

But Costas was a pro with something to prove.

If he could crack a legendary case featured on primetime television, it could make his career.

It was time to tighten the net.

Costa shifted from finding family to watching them.

His opening move was to place federal mail covers on the homes of Tim White and Leona Julius, having the Postal Service document all incoming and outgoing mail and send the reports straight to him.

But letters could take days.