Amidst the heartbreak of Alzheimer's, there is real reason for hope. This two-hour, two-part documentary takes viewers inside the laboratories and clinics of 25 leading scientists and physicians, who seek to discover what can be done to better detect and diagnose Alzheimer's, delay the onset of memory loss, affect the brain changes associated with the disease, and ultimately prevent Alzheimer's disease altogether. Two years in the making, the documentary travels coast to coast to explore this complex disease, which scientists believe may have no single cause, but may develop from a number of factors that interact over many years. Scientists are zeroing in on both genetic and environmental factors that might cause Alzheimer's or protect against it. The series delves into the intriguing links to heart disease and diabetes, as well as the potential benefits of exercise or diet. Groundbreaking advances in brain imaging are allowing scientists to peer into the living brain to see the disease at its earliest stages, and revolutionary approaches to treating and preventing Alzheimer's, such as vaccines, are reaching final stages of drug testing.