Using information from the cutting edge of modern science, Peake presents startling evidence that the inner worlds of our mystics and shamans are as real, or possibly even more real, than the reality we experience in waking life. As his starting point, Peake examines the widespread historical belief that the mid-brain's pine-cone shaped pineal gland activates the third eye described by mystics and seers. Through careful analysis of ancient religious texts and artifacts, he gives evidence that the spiritual properties of the pineal gland have been embedded in myths and cultures across the globe. (Why else would the Buddha so often be found wearing a pine cone hat?) Peake then shows that it is through this small organ that we experience lucid dreaming, out-of-body experiences, hypnagogic imagery, near-death experiences, astral travel and the kundalini experience. The book ends with the mind-blowing conclusion that all living beings are one unitary consciousness experiencing itself subjectively.