High school volleyball player Jeanna Giese complains that she's fatigued and has numbness in her arm. When the 15-year-old starts experiencing double-vision and loss of balance, they know it is far more sinister than a sports injury.
Several doctors and CDC authorities spend months trying to figure out what California honeymooners, a surfer in Hawaii and a toddler in Tennessee have in common.
Dr. Bill Lidner collapses just hours after returning home from a family trip overseas; his young daughters find him bleeding on the stairs of their Ohio home; they don't know it, but it is the first sign that something is very wrong.
Paul and Alison Frase were told their child's disorder had no treatment and no cure. Scientists tell them their one hope depends on finding a dog and the right genetic code - they set on a quest to find that one-in-a-million dog.
Florida college student Lindsey Meyer and Michigan E.M.T Kevin Nesbit both come down with a painful sore throat. What seems like a symptom of the common cold, soon spirals into a life or death situation.
What really happens when we die? For thousands of years, the dreams and visions of the dying have captivated cultures. But what are they - what causes them? And are they real?