Dr. Mary Neal is a spinal surgeon with an adventurous side. She used to think that near-death experiences could be written off by science – caused by lack of oxygen or certain drugs. But on a kayaking trip down the rapids she becomes trapped under water for 27 minutes – and changes her mind. T. Scott Marr was on life support. His family is told that he had a massive stroke, and brain death is inevitable. They pull the plug. Then, he wakes up – and has an amazing story to tell. Everyone has a perception of death – but 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?