Melinda Elkins' husband had been falsely accused of raping and killing her mother and raping her 6-year-old niece. She knew he was innocent, but she didn't have the training or the money to pull off a major murder investigation .. especially when prosecutors were convinced they had their man.

Could she change their minds?

Read a preview blog from correspondent Sara James:

"Sometimes you do a story and think, 'This should be a movie.' Sometimes you meet a person and think, 'She's a genuine hero.' This is that kind of story. Melinda Elkins is that kind of person. But here's the interesting thing about such people in real life. They don't wear 'hero' on their sleeve. When I first met Melinda -- if I hadn't known her extraordinary tale of audacity and courage in the face of overwhelming, potentially life-destroying adversity -- what would have struck me first was simply how much fun she is. Because Melinda is warm, outgoing, vivacious. But as our talk lengthened, as I heard the details of how her husband Clarence had been incarcerated for years for horrific crimes she didn't believe he'd committed, I saw a steely flash in her bright blue eyes." Click here to read more.

Image: Clarence Elkins