A mother arrives home to have lunch with her teenage daughter and walks into a nightmare she will never forget. On the Case with Paula Zahn investigates tonight at 10/9c. | Investigation Discovery

A teenage girl disappears on her way to visit friends. As police retrace her last known movements they uncover a terrifying possibility, the 16-year-old may have been kidnapped by an international human trafficking ring. Join us for On the Case with Paula Zahn tonight at 10/9c. | Investigation Discovery

When a young woman disappears on a cold night in Breckenridge Colorado, one of the state's darkest mysteries begins. Join us for On the Case with Paula Zahn tonight at 10/9c. | Investigation Discovery

When a young mother vanishes, her trail goes cold. Until a shocking discovery reveals that history repeats itself. On the Case with Paula Zahn investigates tonight at 10/9c. | Investigation Discovery