Recently laid-off from his newspaper and desperate for work, war correspondent Nick Bishop takes a humbling job: writing a profile of a new mindfulness app called Clarity. It's easy money, and a chance to return to his hometown for the first time in years. The app itself seems like a retread of old ideas--relaxing white noise and guided meditations. But then there are the "Sleep Songs." A woman's hauntingly beautiful voice sings a ballad that is...