Upton Sinclair is primarily known as the Pulitzer Prize-winning author of “The Jungle”, “Oil”, and “Dragon's Teeth”, and as a fiery advocate of social justice and reform. Few know, however, of Sinclair's deep interest in, and connection to, psychic research. Sinclair's own wife, Mary Craig Kimbrough, claimed to have "mind reading" or telepathic abilities, and asked Sinclair to help her better understand these abilities. He devised a fascinating...