After having a nationally televised panic attack, Dan Harris knew he had to make some changes. A lifelong nonbeliever, he found himself on a bizarre adventure involving a disgraced pastor, a mysterious self-help guru, and a gaggle of brain scientists. Eventually, Harris realized that the source of his problems was the very thing he always thought was his greatest asset: the incessant, insatiable voice in his head, which had propelled him through the ranks of a hypercompetitive business, but had also led him to make the profoundly stupid decisions that provoked his on-air freak-out.