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.

What do California honeymooners, a surfer in Hawaii and a toddler in Tennessee have in common is investigated.

Dr. Bill Lidner was found by his daughters bleeding on the stairs of their home after a family trip abroad.

Paul and Alison Frase set out to find the rare dog that could cure their child's condition.

College student Lindsey Meyer and 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.