A high school teacher mysteriously disappeared.

Did she go on vacation without telling anyone,

or was she taken against her will?

Could forensic science find the answer?

Not all students do well in traditional schools.

For teenagers in San Antonio, Texas,

the Robbins Academy is an alternative for high school students who need extra help.

Well, Robbins takes two kinds of students.

Students who just simply don't do well in the sort of traditional high school environment.

And also students who have failed out of disciplinary issues, attendance issues, behavioral issues.

58-year-old Diane Tilley was one of the school's founders.

Her success with troubled students earned her the nickname, the Miracle Worker.

Diane Tilley was the kind of teacher who really believed in her students and saw potential in them, and they responded to that.

And she had something about her that she was able to work with these individuals and get the most out of them, motivate them, raise their self-esteem.

The day before Thanksgiving in 2004, Diane Tilley wasn't at school at her usual time,

so her coworkers drove over to her home to check on her.

I knocked on the door, there was nowhere to look in the window.

They saw that the place was just in the state of this area that became alarmed.

Police were called to the scene, and they knew immediately there had been a robbery.

It's ran second. Things scattered all over the place.

The house looked like it had been turned inside out.

Even the linen closet had completely been gone through.

...