José Díaz-Balart

Ana didn't mind waiting, especially now that she'd found a new life in Spain.

So why would she suddenly disappear?

FBI agent Alex Montilla knew this was much more than a missing persons case.

Agent Montilla learned that Ana usually raved about her new adventures.

And yet, the friend who first called police to report her missing told them Ana had been depressed lately.

She said, I fear she may have taken her life.

But when Agent Montilla spoke with Sana and Eliza, they told her on the day she disappeared, Ana seemed perfectly happy.

In fact, she was looking for a new apartment.

She left Sana a voice message about it.

Aliza and Sana didn't believe Ana had harmed herself.

They were convinced someone else was to blame, and they were about to find proof at Ana's apartment building.

It was the building's super, and she told them something harrowing.

Someone sabotaging the camera?

Sana knew it was a bad sign.

Sana didn't know that El Grupo 12, one of Spain's most elite police squads, was about to join the investigation.

Their specialty, cracking the most impossible cases.

Veteran detective Remo Rodriguez took the lead.

I think everyone has their own way of working.

Mine in particular is to go little by little, pulling a thread, which leads me to the next one, and which leads me to the next one.

His first thread, that man spray painting the security camera.