Drawing on previously untapped archives of participant-reported data, Alicia Puglionesi recounts how an eclectic group of investigators tried to capture the most elusive dimensions of human consciousness. A vast though flawed experiment in democratic science, psychical research gave participants valuable tools with which to study their experiences on their own terms. Academic psychology would ultimately disown this effort as both a scientific failure and a remnant of magical thinking, but its challenge to the limits of science, the mind, and the soul still reverberates today.