"Mental Radio" by Upton Sinclair is a captivating foray into the uncharted territory of telepathy and clairvoyance by a man better known for his politically influential novels and journalism. Venturing beyond the realms of political exposés, Sinclair candidly shares his reluctant exploration into the realms of extra-sensory perception, spurred by the extraordinary abilities of his wife, Mary Craig Sinclair. Fueled by her premonitions, including an eerie insight into Jack London's mental turmoil before his suicide, the Sinclairs embarked on a fascinating investigation.

At the heart of the book are the doodles created outside Craig's presence, which she astonishingly duplicates through what appears to be telepathic or clairvoyant means. Sinclair presents compelling evidence, citing a remarkable 75% success rate over 290 tests, challenging conventional notions of probability. Esteemed figures, including Albert Einstein and William McDougal, attested to the credibility of the Sinclairs' experiments, leaving readers to grapple with the intersection of Sinclair's reputation as a truth-teller and the inexplicable world of extrasensory perception.